Question: which river has the largest catchment area in india
[{'answer': 'Ganges', 'provenance': [{'wikipedia_id': '2192160', 'title': 'List of major rivers of India', 'start_paragraph_id': 10, 'start_character': 141, 'end_paragraph_id': 10, 'end_character': 147, 'bleu_score': 1.0, 'section': 'Section::::The Indo-Gangetic plains.\n'}]}]