Question: who played the role of dumbledore in harry potter series
[{'answer': 'Richard Harris', 'provenance': [{'wikipedia_id': '45322', 'title': 'Albus Dumbledore', 'start_paragraph_id': 2, 'start_character': 28, 'end_paragraph_id': 2, 'end_character': 42, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Michael Gambon', 'provenance': [{'wikipedia_id': '45322', 'title': 'Albus Dumbledore', 'start_paragraph_id': 2, 'start_character': 243, 'end_paragraph_id': 2, 'end_character': 257, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '45322', 'title': 'Albus Dumbledore', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 334, 'bleu_score': 0.7218348524753211, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11494153278670386353}, 'section': 'Section::::Abstract.'}]}]