Question: who was heading the indian army during bangladesh war of 1971
[{'answer': 'General Sam Manekshaw', 'provenance': [{'wikipedia_id': '464071', 'title': 'Indo-Pakistani War of 1971', 'start_paragraph_id': 16, 'start_character': 558, 'end_paragraph_id': 16, 'end_character': 579, 'bleu_score': 1.0, 'section': "Section::::India's involvement in Bangladesh Liberation War.\n"}]}, {'provenance': [{'wikipedia_id': '464071', 'title': 'Indo-Pakistani War of 1971', 'start_paragraph_id': 16, 'start_character': 0, 'end_paragraph_id': 16, 'end_character': 1650, 'bleu_score': 0.812011356889152, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5764530134020194651}, 'section': "Section::::India's involvement in Bangladesh Liberation War.\n"}]}]