Question: who are the main actors in harry potter
[{'answer': 'Daniel Radcliffe', 'provenance': [{'wikipedia_id': '771537', 'title': 'List of Harry Potter cast members', 'start_paragraph_id': 3, 'start_character': 185, 'end_paragraph_id': 3, 'end_character': 201, 'bleu_score': 1.0, 'section': 'Section::::Overview.\n'}]}, {'answer': 'Rupert Grint', 'provenance': [{'wikipedia_id': '771537', 'title': 'List of Harry Potter cast members', 'start_paragraph_id': 3, 'start_character': 223, 'end_paragraph_id': 3, 'end_character': 235, 'bleu_score': 1.0, 'section': 'Section::::Overview.\n'}]}, {'answer': 'Emma Watson', 'provenance': [{'wikipedia_id': '771537', 'title': 'List of Harry Potter cast members', 'start_paragraph_id': 3, 'start_character': 259, 'end_paragraph_id': 3, 'end_character': 270, 'bleu_score': 1.0, 'section': 'Section::::Overview.\n'}]}, {'provenance': [{'wikipedia_id': '771537', 'title': 'List of Harry Potter cast members', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 866, 'bleu_score': 0.856199166248753, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17876565741299447250}, 'section': 'Section::::Overview.\n'}]}]