Question: who played guy gibson in the 1954 film the dambusters
[{'answer': 'Richard Todd', 'provenance': [{'wikipedia_id': '170194', 'title': 'The Dam Busters (film)', 'start_paragraph_id': 1, 'start_character': 57, 'end_paragraph_id': 1, 'end_character': 69, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '170194', 'title': 'The Dam Busters (film)', 'start_paragraph_id': 12, 'start_character': 0, 'end_paragraph_id': 12, 'end_character': 94, 'bleu_score': 0.8702397637697911, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7210739964986470574}, 'section': 'Section::::Cast.\n'}]}]