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
Nagayama spot are seen in: 
Select and explain. 
A. Measles, B. Roseola infantum, C. Mumps, D. Rubella
B: Roseola infantum
Answer: B: Roseola infantum 
Explanation: 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.