Triple

Given a phrase, classify it is english named entity (e.g., persons, organizations, works of art) in Latin script, or not (e.g., literals, dates, URLs, verbose phrases). For disambiguation, the statement where the phrase occurs as object is also given. Please return a JSON object with `phrase` (string, the phrase being analyzed) and `is_ne` (boolean, indicating whether the phrase is a Named Entity).

Phrase: Kerr–Schild coordinates | Statement: [Kerr metric, hasCoordinateSystem, Kerr–Schild coordinates]

Target entity: Kerr–Schild coordinates
Context triple: [Kerr metric, hasCoordinateSystem, Kerr–Schild coordinates]

• A. Boyer–Lindquist coordinates
  Boyer–Lindquist coordinates are a spheroidal coordinate system commonly used in general relativity to express the Kerr solution describing the spacetime around a rotating black hole.
• B. Kruskal–Szekeres coordinates
  Kruskal–Szekeres coordinates are a maximal extension coordinate system used in general relativity to smoothly describe the entire spacetime of a Schwarzschild black hole, including regions across the event horizon.
• C. Eddington–Finkelstein coordinates
  Eddington–Finkelstein coordinates are a coordinate system in general relativity that smoothly covers a black hole’s event horizon, avoiding the coordinate singularity present in standard Schwarzschild coordinates.
• D. Painlevé–Gullstrand coordinates
  Painlevé–Gullstrand coordinates are a coordinate system for the Schwarzschild black hole that is regular at the event horizon and represents spacetime as seen by freely falling observers.
• E. Kerr metric
  The Kerr metric is the exact general relativity solution describing the spacetime geometry around a rotating, uncharged black hole.
• F. None of above. chosen
• G. Unsure - the case is ambiguous/there is not enough information to decide.

Generate a one-sentence description of the target entity. 
You are given a context triple in the form (subject, predicate, object), where the object is the target entity. 
# Instructions
Use the triple to infer relevant information about the entity. Describe the entity based on what is most defining, well-known. 
Avoid repeating the information from the triple, unless really essential.
# Response Format
Return only the sentence: "Description: [one-sentence description of the target entity]"

Entity: Kerr–Schild coordinates
Triple: [Kerr metric, hasCoordinateSystem, Kerr–Schild coordinates]

Kerr–Schild coordinates are a coordinate system used to express the Kerr spacetime metric in a form that highlights its structure as a perturbation of flat Minkowski space along a principal null direction.

Target entity: Kerr–Schild coordinates
Target entity description: Kerr–Schild coordinates are a coordinate system used to express the Kerr spacetime metric in a form that highlights its structure as a perturbation of flat Minkowski space along a principal null direction.

• A. Boyer–Lindquist coordinates
  Boyer–Lindquist coordinates are a spheroidal coordinate system commonly used in general relativity to express the Kerr solution describing the spacetime around a rotating black hole.
• B. Kruskal–Szekeres coordinates
  Kruskal–Szekeres coordinates are a maximal extension coordinate system used in general relativity to smoothly describe the entire spacetime of a Schwarzschild black hole, including regions across the event horizon.
• C. Eddington–Finkelstein coordinates
  Eddington–Finkelstein coordinates are a coordinate system in general relativity that smoothly covers a black hole’s event horizon, avoiding the coordinate singularity present in standard Schwarzschild coordinates.
• D. Painlevé–Gullstrand coordinates
  Painlevé–Gullstrand coordinates are a coordinate system for the Schwarzschild black hole that is regular at the event horizon and represents spacetime as seen by freely falling observers.
• E. Kerr metric
  The Kerr metric is the exact general relativity solution describing the spacetime geometry around a rotating, uncharged black hole.
• F. None of above. chosen