Question: which is the main source of electricity in india
[{'answer': 'Coal', 'provenance': [{'wikipedia_id': '1378862', 'title': 'Electricity sector in India', 'start_paragraph_id': 33, 'start_character': 7, 'end_paragraph_id': 33, 'end_character': 11, 'bleu_score': 1.0, 'section': 'Section::::Electricity generation.\n'}]}]