Question: how many years is med school in us
[{'answer': 'four years', 'provenance': [{'wikipedia_id': '3557044', 'title': 'Medical education in the United States', 'start_paragraph_id': 4, 'start_character': 462, 'end_paragraph_id': 4, 'end_character': 472, 'bleu_score': 1.0, 'section': 'Section::::Medical school.\n'}]}, {'provenance': [{'wikipedia_id': '3557044', 'title': 'Medical education in the United States', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 987, 'bleu_score': 0.937271293758083, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6199244399714016568}, 'section': 'Section::::Medical school.\n'}]}]