Question: who played sirius black in the harry potter series
[{'answer': 'Oldman', 'provenance': [{'wikipedia_id': '213163', 'title': 'Gary Oldman', 'start_paragraph_id': 0, 'start_character': 5, 'end_paragraph_id': 0, 'end_character': 11, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '213163', 'title': 'Gary Oldman', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 777, 'bleu_score': 0.5639225198154231, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11611571705594414483}, 'section': 'Section::::Abstract.'}]}]