Question: who was the movie american sniper based on
[{'answer': 'Chris Kyle', 'provenance': [{'wikipedia_id': '39462431', 'title': 'American Sniper', 'start_paragraph_id': 1, 'start_character': 249, 'end_paragraph_id': 1, 'end_character': 259, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '39462431', 'title': 'American Sniper', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 903, 'bleu_score': 0.9868845362499331, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3796959598568845119}, 'section': 'Section::::Abstract.'}]}]