Question: who was the heading the indian army during the bangladesh liberation war 1971
[{'answer': 'Indira Gandhi', 'provenance': [{'wikipedia_id': '672766', 'title': 'Bangladesh Liberation War', 'start_paragraph_id': 4, 'start_character': 550, 'end_paragraph_id': 4, 'end_character': 563, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '672766', 'title': 'Bangladesh Liberation War', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 1050, 'bleu_score': 0.9871375943883031, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4657189320066832780}, 'section': 'Section::::Abstract.'}]}]