Question: nadal and federer are names related to which sport
[{'answer': 'Tennis', 'provenance': [{'wikipedia_id': '1439517', 'title': 'Rafael Nadal', 'start_paragraph_id': 1, 'start_character': 166, 'end_paragraph_id': 1, 'end_character': 172, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1439517', 'title': 'Rafael Nadal', 'start_paragraph_id': 63, 'start_character': 0, 'end_paragraph_id': 63, 'end_character': 319, 'bleu_score': 0.96188712955549, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3996551309115718839}, 'section': 'Section::::Professional tennis career.:2011: Sixth French Open title and Davis Cup crown.\n'}]}]