Question: who was the movie american gangster based on
[{'answer': 'Frank Lucas', 'provenance': [{'wikipedia_id': '5017604', 'title': 'American Gangster (film)', 'start_paragraph_id': 1, 'start_character': 187, 'end_paragraph_id': 1, 'end_character': 198, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '5017604', 'title': 'American Gangster (film)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 670, 'bleu_score': 0.9134991639133121, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3728274738811053738}, 'section': 'Section::::Abstract.'}]}]