Question: What river flows through 9 counties in states in the U.S. and is also a tributary to the Swannanoa River?
{'answer': 'The Swannanoa River flows through the Swannanoa Valley of western North Carolina, and is a major tributary to the French Broad River', 'supporting_facts': [['Swannanoa River', 0], ['French Broad River', 2]]}