Question: when did the mcdonald's join coronation street
[{'answer': 'in December 1989', 'provenance': [{'wikipedia_id': '2275113', 'title': 'Steve McDonald (Coronation Street)', 'start_paragraph_id': 4, 'start_character': 52, 'end_paragraph_id': 4, 'end_character': 68, 'bleu_score': 1.0, 'section': 'Section::::Storylines.\n'}]}, {'provenance': [{'wikipedia_id': '2275113', 'title': 'Steve McDonald (Coronation Street)', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 2241, 'bleu_score': 0.8912066759079851, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7532838286495651317}, 'section': 'Section::::Storylines.\n'}]}]