This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Social & Preventive Medicine
What is the mass chemoprophylaxis for meningococcal meningitis ? 
Select and explain. 
A. Rifampicin, B. Chloramphenicol, C. Tetracycline, D. Penicillin
A: Rifampicin
Answer: A: Rifampicin 
Explanation: Recommended Chemoprophylaxis for High-Risk Close Contacts: Age Dose Duration Cautions RIFAMPICIN: <1 month 5 mg/kg Oral every 12 hrs 2 days >1 month 10 mg/kg Oral every 12 hrs 2 day Not recommended for use in pregnancy CEFTRIAXONE: <15 years 125mg IM single dose >15 years 250 mg IM single dose CIPROFLOXACIN >18 years 500 mg Oral single dose Not recommended for use in pregnancy ref : park 21st ed