Question: who are the judges on america's got talent for 2018
[{'answer': 'Howie Mandel', 'provenance': [{'wikipedia_id': '57001539', 'title': "America's Got Talent (season 13)", 'start_paragraph_id': 1, 'start_character': 108, 'end_paragraph_id': 1, 'end_character': 120, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Mel B', 'provenance': [{'wikipedia_id': '57001539', 'title': "America's Got Talent (season 13)", 'start_paragraph_id': 1, 'start_character': 122, 'end_paragraph_id': 1, 'end_character': 127, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Heidi Klum', 'provenance': [{'wikipedia_id': '57001539', 'title': "America's Got Talent (season 13)", 'start_paragraph_id': 1, 'start_character': 129, 'end_paragraph_id': 1, 'end_character': 139, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Simon Cowell', 'provenance': [{'wikipedia_id': '57001539', 'title': "America's Got Talent (season 13)", 'start_paragraph_id': 1, 'start_character': 144, 'end_paragraph_id': 1, 'end_character': 156, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]