Question: when did john terry first play for chelsea
[{'answer': '28 October 1998', 'provenance': [{'wikipedia_id': '446099', 'title': 'John Terry', 'start_paragraph_id': 9, 'start_character': 32, 'end_paragraph_id': 9, 'end_character': 47, 'bleu_score': 1.0, 'section': 'Section::::Club career.:Chelsea.:Early years.\n'}]}, {'provenance': [{'wikipedia_id': '446099', 'title': 'John Terry', 'start_paragraph_id': 9, 'start_character': 0, 'end_paragraph_id': 9, 'end_character': 421, 'bleu_score': 0.9304844600065421, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8425802651485471349}, 'section': 'Section::::Club career.:Chelsea.:Early years.\n'}]}]