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: Social & Preventive Medicine
Chemoprophylaxis for meningococcal meningitis 
Select and explain. 
A. Ampicillin, B. Rifampicin, C. Tetracycline, D. Erythromycin
B: Rifampicin
Answer: B: Rifampicin 
Explanation: None