Question: total number of railway recruitment board in india
[{'answer': '21 boards', 'provenance': [{'wikipedia_id': '37520676', 'title': 'Railway Recruitment Control Board', 'start_paragraph_id': 9, 'start_character': 158, 'end_paragraph_id': 9, 'end_character': 167, 'bleu_score': 1.0, 'section': 'Section::::Railway Recruitment Boards.:Overview.\n'}]}, {'provenance': [{'wikipedia_id': '37520676', 'title': 'Railway Recruitment Control Board', 'start_paragraph_id': 9, 'start_character': 0, 'end_paragraph_id': 9, 'end_character': 204, 'bleu_score': 0.9383861709333501, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 245101899793921377}, 'section': 'Section::::Railway Recruitment Boards.:Overview.\n'}]}]