Question: who was heading indian army in bangladesh 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': 20, 'start_character': 0, 'end_paragraph_id': 20, 'end_character': 757, 'bleu_score': 0.8345000116845621, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12001071738150817888}, 'section': "Section::::India's official engagement with Pakistan.:Objective.\n"}]}]