Question: who has had the most uk number 1s
[{'answer': 'Elvis Presley', 'provenance': [{'wikipedia_id': '1477679', 'title': 'UK Singles Chart records and statistics', 'start_paragraph_id': 22, 'start_character': 491, 'end_paragraph_id': 22, 'end_character': 504, 'bleu_score': 1.0, 'section': 'Section::::Number one hits.:Most number ones from chart debut.\n'}]}]