Question: who has been the longest serving chief minister of rajasthan
[{'answer': 'Mohan Lal Sukhadia', 'provenance': [{'wikipedia_id': '6928494', 'title': 'List of chief ministers of Rajasthan', 'start_paragraph_id': 2, 'start_character': 60, 'end_paragraph_id': 2, 'end_character': 78, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '6928494', 'title': 'List of chief ministers of Rajasthan', 'start_paragraph_id': 2, 'start_character': 14, 'end_paragraph_id': 2, 'end_character': 272, 'bleu_score': 0.6102026088489481, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1222375029778307035}, 'section': 'Section::::Abstract.'}]}]