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: Niger River system | Statement: [Donga River, partOf, Niger River system]

Target entity: Niger River system
Context triple: [Donga River, partOf, Niger River system]

• A. Niger River chosen
  The Niger River is a major West African river that flows in a great arc through countries including Guinea, Mali, Niger, and Nigeria before emptying into the Atlantic Ocean.
• B. Sanaga River
  The Sanaga River is the longest river in Cameroon, flowing from the central highlands to the Atlantic Ocean and serving as a major source of hydroelectric power and water resources for the country.
• C. Benue River
  The Benue River is a major West African waterway and the largest tributary of the Niger River, flowing through Cameroon and Nigeria and serving as an important route for transport, agriculture, and fishing.
• D. Athi River basin
  The Athi River basin is a major drainage basin in Kenya that collects waters from rivers such as the Nairobi River and ultimately feeds into the Indian Ocean.
• E. Niger River valley
  The Niger River valley is a fertile and historically significant region in West Africa that has long supported dense human settlement, agriculture, and trade along the course of the Niger River.
• F. None of above.
• G. Unsure - the case is ambiguous/there is not enough information to decide.