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': 'Antibodies to one of the following infection are not transmitted to a child – \nSelect and explain. \nA. Measles, B. Pertusis, C. Diphtheria, D. Polio', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Protective Antibodies against pertussis do not cross placenta.\nSo, early immunization is desired.', 'role': 'assistant'}]