Rio Negro

Target entity: Rio Negro
Context triple: [Amazon River, majorTributary, Rio Negro]

• A. Amazon River
  The Amazon River is one of the world's longest and largest rivers by discharge, flowing across northern South America through the Amazon rainforest and into the Atlantic Ocean.
• B. Orinoco River
  The Orinoco River is one of the longest and most important rivers in South America, flowing through Venezuela and Colombia and supporting vast tropical ecosystems and human settlements.
• C. Paraná River
  The Paraná River is one of South America's longest and most important rivers, flowing through Brazil, Paraguay, and Argentina and serving as a key waterway for transport, hydroelectric power, and regional ecosystems.
• D. Napo River
  The Napo River is a major tributary of the Amazon River in northwestern South America, flowing from the Andes through Ecuador into Peru and supporting rich rainforest ecosystems and indigenous communities.
• E. Paraguay River
  The Paraguay River is a major South American waterway that flows through Brazil, Bolivia, Paraguay, and Argentina, forming part of the Río de la Plata Basin and serving as a vital route for transport, agriculture, and ecosystems in the region.
• F. None of above. chosen
• G. Unsure - the case is ambiguous/there is not enough information to decide.

Target entity: Rio Negro
Target entity description: Rio Negro is a major blackwater river in South America that flows through Colombia, Venezuela, and Brazil before joining the Amazon River.

• A. Amazon River
  The Amazon River is one of the world's longest and largest rivers by discharge, flowing across northern South America through the Amazon rainforest and into the Atlantic Ocean.
• B. Orinoco River
  The Orinoco River is one of the longest and most important rivers in South America, flowing through Venezuela and Colombia and supporting vast tropical ecosystems and human settlements.
• C. Paraná River
  The Paraná River is one of South America's longest and most important rivers, flowing through Brazil, Paraguay, and Argentina and serving as a key waterway for transport, hydroelectric power, and regional ecosystems.
• D. Napo River
  The Napo River is a major tributary of the Amazon River in northwestern South America, flowing from the Andes through Ecuador into Peru and supporting rich rainforest ecosystems and indigenous communities.
• E. Paraguay River
  The Paraguay River is a major South American waterway that flows through Brazil, Bolivia, Paraguay, and Argentina, forming part of the Río de la Plata Basin and serving as a vital route for transport, agriculture, and ecosystems in the region.
• F. None of above. chosen