This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
[{'content': 'Nagayama spots is seen in \nSelect and explain. \nA. Measles, B. Mumps, C. Rubella, D. Roseola infantum', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ulcer at Uvulopalatoglossal\xa0 junction is called Nagayama spots caused by Roseola infantum.', 'role': 'assistant'}]