Question: who has won the most mens australian open titles
[{'answer': 'Roy Emerson', 'provenance': [{'wikipedia_id': '773332', 'title': "List of Australian Open men's singles champions", 'start_paragraph_id': 7, 'start_character': 201, 'end_paragraph_id': 7, 'end_character': 212, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'answer': 'Novak Djokovic', 'provenance': [{'wikipedia_id': '773332', 'title': "List of Australian Open men's singles champions", 'start_paragraph_id': 7, 'start_character': 437, 'end_paragraph_id': 7, 'end_character': 451, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'answer': 'Roger Federer', 'provenance': [{'wikipedia_id': '773332', 'title': "List of Australian Open men's singles champions", 'start_paragraph_id': 4, 'start_character': 236, 'end_paragraph_id': 4, 'end_character': 249, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}]