Question: who is known as iron man of india
[{'answer': 'Patel', 'provenance': [{'wikipedia_id': '59659', 'title': 'Vallabhbhai Patel', 'start_paragraph_id': 0, 'start_character': 12, 'end_paragraph_id': 0, 'end_character': 17, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '59659', 'title': 'Vallabhbhai Patel', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 675, 'bleu_score': 0.560342002854281, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4030881465623058515}, 'section': 'Section::::Abstract.'}]}]