Question: who has the most wins in the xfinity series
[{'answer': 'Bill Elliott', 'provenance': [{'wikipedia_id': '4603332', 'title': "NASCAR's Most Popular Driver Award", 'start_paragraph_id': 3, 'start_character': 33, 'end_paragraph_id': 3, 'end_character': 45, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '4603332', 'title': "NASCAR's Most Popular Driver Award", 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 240, 'bleu_score': 0.542215431844221, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8096496314827660864}, 'section': 'Section::::Abstract.'}]}]