Question: when did war admiral win the triple crown
[{'answer': '1937', 'provenance': [{'wikipedia_id': '223498', 'title': 'War Admiral', 'start_paragraph_id': 1, 'start_character': 171, 'end_paragraph_id': 1, 'end_character': 175, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '223498', 'title': 'War Admiral', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 566, 'bleu_score': 0.903787934681591, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6270667444590588299}, 'section': 'Section::::Abstract.'}]}]