Question: who won anderson silva vs chael sonnen 1
[{'answer': 'Silva', 'provenance': [{'wikipedia_id': '14760049', 'title': 'Chael Sonnen', 'start_paragraph_id': 1, 'start_character': 584, 'end_paragraph_id': 1, 'end_character': 589, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '14760049', 'title': 'Chael Sonnen', 'start_paragraph_id': 22, 'start_character': 0, 'end_paragraph_id': 22, 'end_character': 656, 'bleu_score': 0.8935910079772771, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3256509456476957916}, 'section': 'Section::::Mixed martial arts career.:Return to UFC.:Silva vs Sonnen.\n'}]}]