Question: who is the chairman of central board of film certification
[{'answer': 'Prasoon Joshi', 'provenance': [{'wikipedia_id': '5330978', 'title': 'Central Board of Film Certification', 'start_paragraph_id': 48, 'start_character': 121, 'end_paragraph_id': 48, 'end_character': 134, 'bleu_score': 1.0, 'section': 'Section::::Composition and leadership.\n'}]}, {'provenance': [{'wikipedia_id': '5330978', 'title': 'Central Board of Film Certification', 'start_paragraph_id': 48, 'start_character': 0, 'end_paragraph_id': 48, 'end_character': 657, 'bleu_score': 0.8161706020492641, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17802617366843540725}, 'section': 'Section::::Composition and leadership.\n'}]}]