Question: who played the title role in 1971's willy wonka & the chocolate factory
[{'answer': 'Gene Wilder', 'provenance': [{'wikipedia_id': '174560', 'title': 'Willy Wonka & the Chocolate Factory', 'start_paragraph_id': 1, 'start_character': 119, 'end_paragraph_id': 1, 'end_character': 130, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '174560', 'title': 'Willy Wonka & the Chocolate Factory', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 556, 'bleu_score': 0.9352076177156141, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1216421259639588148}, 'section': 'Section::::Abstract.'}]}]