Question: when was major depressive disorder added to the dsm
[{'answer': '1980', 'provenance': [{'wikipedia_id': '8389', 'title': 'Major depressive disorder', 'start_paragraph_id': 4, 'start_character': 651, 'end_paragraph_id': 4, 'end_character': 655, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '8389', 'title': 'Major depressive disorder', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 886, 'bleu_score': 0.945516411395747, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15001295140843484975}, 'section': 'Section::::Abstract.'}]}]