Question: when did mizoram became a state of india
[{'answer': '20 February 1987', 'provenance': [{'wikipedia_id': '461211', 'title': 'Mizoram', 'start_paragraph_id': 2, 'start_character': 211, 'end_paragraph_id': 2, 'end_character': 227, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '461211', 'title': 'Mizoram', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 292, 'bleu_score': 0.894469666469155, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18412945821750112087}, 'section': 'Section::::Abstract.'}]}]