This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Considerations - Infectious Diseases, Subject name: Pediatrics
[{'content': 'Nagayama spot are seen in: \nSelect and explain. \nA. Measles, B. Roseola infantum, C. Mumps, D. Rubella', 'role': 'user'}, {'content': 'Answer: B \nExplanation: b. Roseola infantum(Ref: Nelson 20/e p 1594-1596)Ulcers at uvulopalatoglossal junction (Nagayama spots) are commonly reported in infants with roseola infantum. High fever is the most consistent finding associated with primary HHV-6B infection.', 'role': 'assistant'}]