Question: who has the most wins at bristol speedway
[{'answer': 'Darrell Waltrip', 'provenance': [{'wikipedia_id': '794321', 'title': 'Bristol Motor Speedway', 'start_paragraph_id': 26, 'start_character': 349, 'end_paragraph_id': 26, 'end_character': 364, 'bleu_score': 1.0, 'section': 'Section::::Track history.\n'}]}]