Question: in which year milkha singh won 400m race
[{'answer': '1958', 'provenance': [{'wikipedia_id': '20024623', 'title': 'Milkha Singh', 'start_paragraph_id': 1, 'start_character': 389, 'end_paragraph_id': 1, 'end_character': 393, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': '1962', 'provenance': [{'wikipedia_id': '20024623', 'title': 'Milkha Singh', 'start_paragraph_id': 1, 'start_character': 398, 'end_paragraph_id': 1, 'end_character': 402, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]