Question: who played biff in back to the future movies
[{'answer': 'Thomas Francis Wilson Jr.', 'provenance': [{'wikipedia_id': '273626', 'title': 'Thomas F. Wilson', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 25, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '273626', 'title': 'Thomas F. Wilson', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 331, 'bleu_score': 0.8831730412242561, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17951258428774099227}, 'section': 'Section::::Abstract.'}]}]