Question: who plays captain america in the first avenger
[{'answer': 'Chris Evans', 'provenance': [{'wikipedia_id': '26999426', 'title': 'Captain America: The First Avenger', 'start_paragraph_id': 1, 'start_character': 350, 'end_paragraph_id': 1, 'end_character': 361, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '26999426', 'title': 'Captain America: The First Avenger', 'start_paragraph_id': 12, 'start_character': 0, 'end_paragraph_id': 12, 'end_character': 1794, 'bleu_score': 0.9633129273497381, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 921920780625191156}, 'section': 'Section::::Cast.\n'}]}]