This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Other Respiratory Disorders, Subject name: Pediatrics
All of the following vaccines can prevent pneumonia except: 
Select and explain. 
A. Measles, B. Rubella, C. Pneumococcal, D. H. influenza
B: Rubella
Answer: B: Rubella 
Explanation: Common causes of pneumonia in children: Str. pneumoniae & H. influenza. So Pneumococcal vaccine & Hib vaccine can prevent pneumonia. Measles decreases the cell mediated immunity in children so predisposes the child to infections Therefore on giving measles vaccine it prevents some amount of infections too.