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: USNO Master Clock | Statement: [U.S. Naval Observatory Master Clock, alsoKnownAs, USNO Master Clock]

Target entity: USNO Master Clock
Context triple: [U.S. Naval Observatory Master Clock, alsoKnownAs, USNO Master Clock]

• A. U.S. Naval Observatory Master Clock chosen
  The U.S. Naval Observatory Master Clock is the primary time standard of the United States, providing ultra-precise reference time for military, governmental, and global positioning system (GPS) operations.
• B. International Atomic Time
  International Atomic Time is a high-precision time standard based on the combined output of atomic clocks worldwide, serving as the fundamental reference for modern civil and scientific timekeeping.
• C. IERS Rapid Service/Prediction Centre
  The IERS Rapid Service/Prediction Centre is a specialized unit that rapidly determines and forecasts Earth orientation parameters, such as polar motion and variations in the length of day, for global geodetic and astronomical applications.
• D. United States Naval Observatory Flagstaff Station
  The United States Naval Observatory Flagstaff Station is an astronomical observatory in Flagstaff, Arizona, operated by the U.S. Naval Observatory for high-precision astrometric and related observations.
• E. cesium atomic clocks
  Cesium atomic clocks are ultra-precise timekeeping devices that use the microwave frequency of cesium atoms’ electron transitions to define and maintain the international standard for the second.
• F. None of above.
• G. Unsure - the case is ambiguous/there is not enough information to decide.