Question: who did ian mercer play in coronation street
[{'answer': 'Gary Mallett', 'provenance': [{'wikipedia_id': '13451521', 'title': 'Ian Mercer', 'start_paragraph_id': 1, 'start_character': 84, 'end_paragraph_id': 1, 'end_character': 96, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '13451521', 'title': 'Ian Mercer', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 319, 'bleu_score': 0.8944264839442451, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8936670869297683828}, 'section': 'Section::::Abstract.'}]}]