Question: when was the first census done in india
[{'answer': '1872', 'provenance': [{'wikipedia_id': '42338427', 'title': 'Census of India prior to independence', 'start_paragraph_id': 4, 'start_character': 109, 'end_paragraph_id': 4, 'end_character': 113, 'bleu_score': 1.0, 'section': 'Section::::Administrative background.\n'}]}]