Question: who is the longest serving chief minister in india
[{'answer': 'Jyotirindra Basu', 'provenance': [{'wikipedia_id': '1009245', 'title': 'Jyoti Basu', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 16, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1009245', 'title': 'Jyoti Basu', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 610, 'bleu_score': 0.7894431309449601, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3315571375832150294}, 'section': 'Section::::Abstract.'}]}]