Question: what is the main cause of water pollution in india
[{'answer': 'untreated sewage', 'provenance': [{'wikipedia_id': '35739126', 'title': 'Water pollution in India', 'start_paragraph_id': 5, 'start_character': 37, 'end_paragraph_id': 5, 'end_character': 53, 'bleu_score': 1.0, 'section': 'Section::::The issues.:Untreated Sewage.\n'}]}, {'provenance': [{'wikipedia_id': '35739126', 'title': 'Water pollution in India', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 159, 'bleu_score': 0.5053722394029431, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14719592495329153159}, 'section': 'Section::::Abstract.'}]}]