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: Oka–Volga river system | Statement: [Upa River, hasHydrologicalSystem, Oka–Volga river system]

Target entity: Oka–Volga river system
Context triple: [Upa River, hasHydrologicalSystem, Oka–Volga river system]

• A. Volga–Oka river network chosen
  The Volga–Oka river network is a major interconnected system of waterways in European Russia centered on the Volga and Oka rivers, supporting regional transport, ecology, and settlement.
• B. Volga–Kama river system
  The Volga–Kama river system is a major interconnected river network in European Russia, centered on the Volga and Kama rivers and their tributaries, that drains a vast portion of the East European Plain into the Caspian Sea.
• C. Upper Volga
  The Upper Volga is the northernmost section of the Volga River basin, encompassing the river’s headwaters and early course before it turns southeast toward central Russia.
• D. Msta River
  The Msta River is a waterway in northwestern Russia that flows from the Valdai Hills through the Novgorod and Tver regions before joining the Volkhov River basin.
• E. Volga waterway system
  The Volga waterway system is an extensive network of interconnected rivers, reservoirs, and canals centered on the Volga River that forms a major inland transportation and shipping route across western Russia.
• F. None of above.
• G. Unsure - the case is ambiguous/there is not enough information to decide.