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: Potomac River system | Statement: [North Fork South Branch Potomac River, tributaryOf, Potomac River system]

Target entity: Potomac River system
Context triple: [North Fork South Branch Potomac River, tributaryOf, Potomac River system]

• A. Severn River system
  The Severn River system is the interconnected network of the River Severn and its tributaries, forming one of the major drainage basins in Great Britain.
• B. Potomac River chosen
  The Potomac River is a major waterway in the Mid-Atlantic United States that flows through the Appalachian region and forms part of the boundary between Maryland, Virginia, and Washington, D.C.
• C. Anacostia River and Potomac River
  The Anacostia River and Potomac River are two major waterways in the Washington, D.C. area whose confluence forms a significant geographic and ecological feature of the region.
• D. Shenandoah River
  The Shenandoah River is a scenic waterway flowing through Virginia and West Virginia, famed for its pastoral valleys, Blue Ridge Mountain backdrop, and prominence in American folk music and Civil War history.
• E. Forth river system
  The Forth river system is a network of rivers and tributaries in central Scotland that drain into the Firth of Forth and ultimately the North Sea.
• F. None of above.
• G. Unsure - the case is ambiguous/there is not enough information to decide.