Question: who held the 200m world record before usain bolt
[{'answer': 'Michael Johnson', 'provenance': [{'wikipedia_id': '18982988', 'title': "Men's 200 metres world record progression", 'start_paragraph_id': 12, 'start_character': 338, 'end_paragraph_id': 12, 'end_character': 353, 'bleu_score': 1.0, 'section': 'Section::::Records post-1977.\n'}]}]