This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
DOC for Meningococcal chemoprophylaxis is - 
Select and explain. 
A. Penicillin, B. Gentamicin, C. Rifampicin, D. Chloramphenicol
C: Rifampicin
Answer: C: Rifampicin 
Explanation: Ans. C. RifampicinClose (household and kissing, HCW's) contacts of individuals with meningococcal disease are at increased risk (up to 1,000 times the rate for the general population) of developing secondary disease.Chemoprophylaxis:a. Adults- Ciprofloxacin-500mg oral single dose OR Ceftriaxone-single dose I/M or IV;b. Children-Rifampicin-4 doses over 2 days OR Ceftriaxone-single dose I/M or IV.c. Pregnant- Ceftriaxone-single dose I/M or IV.