Question: the states of manipur tripura and meghalaya were formed in
[{'answer': '1971', 'provenance': [{'wikipedia_id': '602639', 'title': 'Northeast India', 'start_paragraph_id': 2, 'start_character': 115, 'end_paragraph_id': 2, 'end_character': 119, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]