**Core Concept**
The treatment of contacts of meningococcal meningitis involves prophylaxis to prevent the spread of the disease. This is achieved by administering antibiotics that are effective against Neisseria meningitidis, the causative organism.

**Why the Correct Answer is Right**
Prophylaxis with antibiotics such as rifampicin or ciprofloxacin is effective in eliminating the carrier state in contacts, thereby preventing the spread of the disease. Rifampicin acts by inhibiting DNA-dependent RNA polymerase, which is essential for bacterial replication. This prevents the bacteria from multiplying and reduces the risk of transmission.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify the type of antibiotic or the mechanism of action. While antibiotics are essential for treating meningococcal meningitis, the type of antibiotic and the duration of treatment may vary depending on the clinical scenario.
**Option B:** This option is incorrect because it does not mention the specific antibiotic or the mechanism of action. While antibiotics are essential for treating meningococcal meningitis, the type of antibiotic and the duration of treatment may vary depending on the clinical scenario.
**Option C:** This option is incorrect because it does not specify the type of antibiotic or the mechanism of action. While antibiotics are essential for treating meningococcal meningitis, the type of antibiotic and the duration of treatment may vary depending on the clinical scenario.

**Clinical Pearl / High-Yield Fact**
It is essential to note that prophylaxis with antibiotics should be administered to all close contacts of a patient with meningococcal meningitis, including family members, household contacts, and individuals who have had close contact with the patient.

**Correct Answer: C. Ciprofloxacin**