Question: who starred in the movie on the waterfront
[{'answer': 'Marlon Brando', 'provenance': [{'wikipedia_id': '42361', 'title': 'On the Waterfront', 'start_paragraph_id': 1, 'start_character': 118, 'end_paragraph_id': 1, 'end_character': 131, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '42361', 'title': 'On the Waterfront', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 759, 'bleu_score': 0.946714574212115, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6297891263988325741}, 'section': 'Section::::Abstract.'}]}]