Question: who are the judges on x factor uk 2015
[{'answer': 'Simon Cowell', 'provenance': [{'wikipedia_id': '41376025', 'title': 'The X Factor (British series 12)', 'start_paragraph_id': 1, 'start_character': 187, 'end_paragraph_id': 1, 'end_character': 199, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Cheryl Fernandez - Versini', 'provenance': [{'wikipedia_id': '41376025', 'title': 'The X Factor (British series 12)', 'start_paragraph_id': 3, 'start_character': 767, 'end_paragraph_id': 3, 'end_character': 795, 'bleu_score': 1.0, 'section': 'Section::::Judges, presenters and other personnel.\n'}]}, {'answer': 'Rita Ora', 'provenance': [{'wikipedia_id': '41376025', 'title': 'The X Factor (British series 12)', 'start_paragraph_id': 1, 'start_character': 348, 'end_paragraph_id': 1, 'end_character': 356, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Nick Grimshaw', 'provenance': [{'wikipedia_id': '41376025', 'title': 'The X Factor (British series 12)', 'start_paragraph_id': 1, 'start_character': 377, 'end_paragraph_id': 1, 'end_character': 390, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '41376025', 'title': 'The X Factor (British series 12)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 886, 'bleu_score': 0.970600465132858, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2836739718043998435}, 'section': 'Section::::Abstract.'}]}]