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: Social & Preventive Medicine
[{'content': 'All vaccine reduce pneumonia induced moality except? \nSelect and explain. \nA. Measles, B. Rebella, C. HIB, D. Pneumococcal', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is `b' i.e., Rebella Measles vaccine, HIB vaccine (Haemophilus influenzee type B), Pneumococcal vaccines work to reduce the incidence of bacterial pneumonia.", 'role': 'assistant'}]