This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
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: <p>measles complications:- Most common complications are 1. Measles associated diarrhoea. 2. Pneumonia 3. Otitis media 4. Respiratory complications Pneumonia is the most life threatening complication. Pulmonary complications account for more than 90% of deaths due to measles. Neurological complications:- 1. Febrile convulsions 2. SSPE (subacute sclerosing pan encephalitis). This is a rare complication occuring after many years after measles infection. It is characterised by mental deterioration, paralysis, involuntary movements, muscle rigidity and coma. 3. Encephalitis Measles during pregnancy causes congenital anomalies in children. {Reference: park&;s textbook of preventive and social medicine, 23rd edition, pg no.148}</p>