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
[{'content': 'Newborns have transplacentally acquired immunity against all of the following diseases except - \nSelect and explain. \nA. Measles, B. Peusis, C. Diphteria, D. Poliomyelitis', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Peusis", 'role': 'assistant'}]