This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacterial infection, Subject name: Medicine
[{'content': 'Which is the drug of choice for prophylaxis of meningococcal meningitis in pregnancy: \nSelect and explain. \nA. Penicillin, B. Ceftriaxone, C. Rifampicin, D. Ampicillin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: N. meningitidis is dangerous because it can cause Waterhouse Friderichsen syndrome & Addisonian crisis So, chemoprophylaxis is recommended Ceftriaxone as a single IM or IV injection is highly effective in carriage eradication and can be used at all ages and in pregnancy', 'role': 'assistant'}]