Question: when was the national institute of mental health founded
[{'answer': 'April 15 , 1949', 'provenance': [{'wikipedia_id': '455909', 'title': 'National Institute of Mental Health', 'start_paragraph_id': 12, 'start_character': 711, 'end_paragraph_id': 12, 'end_character': 726, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '455909', 'title': 'National Institute of Mental Health', 'start_paragraph_id': 12, 'start_character': 0, 'end_paragraph_id': 12, 'end_character': 1123, 'bleu_score': 0.9880591662583851, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12531966344777705821}, 'section': 'Section::::History.\n'}]}]