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
A child presents with fever and maculo popular rash to OPD. Doctor diagnose it to be measles, which of the following is not be seen during clinical examination of this child? 
Select and explain. 
A. Pneumonia, B. Koplik spots, C. Otitis media, D. Encephalitis
B: Koplik spots
Answer: B: Koplik spots 
Explanation: Koplik spots occurs in Prodromal phase, 1 - 4 days prior to onset of rash.