Question: who played tom hagon in the godfather series
[{'answer': 'Robert Duvall', 'provenance': [{'wikipedia_id': '1983762', 'title': 'Tom Hagen', 'start_paragraph_id': 1, 'start_character': 173, 'end_paragraph_id': 1, 'end_character': 186, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1983762', 'title': 'Tom Hagen', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 199, 'bleu_score': 0.8494499530473011, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13303801643864462546}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1983762', 'title': 'Tom Hagen', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['Thomas Hagen is a fictional character in Mario Puzo\'s novel "The Godfather" and Francis Ford Coppola\'s films "The Godfather" and "The Godfather Part II". He is portrayed by Robert Duvall in the films. He also appears in the Mark Winegardner sequel novels, "The Godfather Returns" and "The Godfather\'s Revenge", as well as Ed Falco\'s novel, "The Family Corleone."\rhighlight sentence(s) containing evidence, not only the answer', 'Thomas Hagen is a fictional character in Mario Puzo\'s novel "The Godfather"', 'Thomas Hagen is a fictional character in Mario Puzo\'s novel "The Godfather" and Francis Ford Coppola\'s films "The Godfather" and "The Godfather Part II". He is portrayed by Robert Duvall in the films.']}}]}]