Question: who is the actor who plays father brown
[{'answer': 'Mark Williams', 'provenance': [{'wikipedia_id': '1010928', 'title': 'Mark Williams (actor)', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 13, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1010928', 'title': 'Mark Williams (actor)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 407, 'bleu_score': 0.834642256992944, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16838536160239229184}, 'section': 'Section::::Abstract.'}]}]