Question: solo artist with most #1 hits on us billboard
[{'answer': 'Elvis Presley', 'provenance': [{'wikipedia_id': '2654171', 'title': 'List of Billboard Hot 100 chart achievements and milestones', 'start_paragraph_id': 212, 'start_character': 54, 'end_paragraph_id': 212, 'end_character': 67, 'bleu_score': 1.0, 'section': 'Section::::Artist achievements.:Most top 10 singles.\n'}]}, {'answer': 'Mariah Carey', 'provenance': [{'wikipedia_id': '2654171', 'title': 'List of Billboard Hot 100 chart achievements and milestones', 'start_paragraph_id': 186, 'start_character': 302, 'end_paragraph_id': 186, 'end_character': 314, 'bleu_score': 1.0, 'section': 'Section::::Artist achievements.:Most number-one singles.\n'}]}]