This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Antibiotics, Subject name: Pharmacology
Which of the following drug is useful in the prophylaxis of meningococcal meningitis? 
Select and explain. 
A. Minocycline, B. Doxycycline, C. Cephalexin, D. Rifabutin
A: Minocycline
Answer: A: Minocycline 
Explanation: Minocycline is used in acne and for prophylaxis of meningococcal meningitis.Ref: HL Sharma 3rd ed Pg: