Question: who are the present judges on american idol
[{'answer': 'Katy Perry', 'provenance': [{'wikipedia_id': '191890', 'title': 'American Idol', 'start_paragraph_id': 3, 'start_character': 484, 'end_paragraph_id': 3, 'end_character': 494, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Luke Bryan', 'provenance': [{'wikipedia_id': '191890', 'title': 'American Idol', 'start_paragraph_id': 3, 'start_character': 500, 'end_paragraph_id': 3, 'end_character': 510, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Lionel Richie', 'provenance': [{'wikipedia_id': '191890', 'title': 'American Idol', 'start_paragraph_id': 3, 'start_character': 469, 'end_paragraph_id': 3, 'end_character': 482, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]