Question: who used to drive the 21 car in nascar
[{'answer': 'Wood Brothers Racing', 'provenance': [{'wikipedia_id': '17341625', 'title': 'Wood Brothers Racing', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 20, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '17341625', 'title': 'Wood Brothers Racing', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 720, 'bleu_score': 0.8535239816804041, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3901083935483245548}, 'section': 'Section::::Abstract.'}]}]