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: Pharmacology
Drug of choice for prophylaxis of meningococcal meningitis is : 
Select and explain. 
A. Penicillin, B. Erythromycin, C. Septran, D. Rifampicin
D: Rifampicin
Answer: D: Rifampicin 
Explanation: None