This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, Subject name: Microbiology
Which of the following is the "Least Common" complication of measles? 
Select and explain. 
A. Diarrhoea, B. Pneumonia, C. Otitis media, D. SSPE
D: SSPE
Answer: D: SSPE 
Explanation: The most serious complication is meningoencephalitis. A rare late complication in subacute sclerosing panencephalitis. REF:ANANTHANARAYAN AND PANIKER'S TEXTBOOK OF MICROBIOLOGY 9TH EDITION PAGE NO:512,513