Question: who was the pm when the report of mandal commission was initially implemented
[{'answer': 'Morarji Desai', 'provenance': [{'wikipedia_id': '1607223', 'title': 'Mandal Commission', 'start_paragraph_id': 1, 'start_character': 190, 'end_paragraph_id': 1, 'end_character': 203, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1607223', 'title': 'Mandal Commission', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 949, 'bleu_score': 0.9626201417602621, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8969600129835927470}, 'section': 'Section::::Abstract.'}]}]