**Core Concept**
Multibacillary leprosy is a severe form of leprosy characterized by a large number of bacteria in the body. The World Health Organization (WHO) recommends a multidrug therapy regimen for its treatment, which includes rifampicin, clofazimine, and dapsone.

**Why the Correct Answer is Right**
The follow-up examination after adequate treatment is crucial to monitor the patient's response to therapy and detect any potential relapse. According to the WHO guidelines, patients with multibacillary leprosy should be followed up for 5 years after completing treatment. This prolonged follow-up period is necessary to ensure that the patient remains bacteriologically negative and does not develop any new lesions or disabilities. The 5-year follow-up period allows for the detection of any potential relapse, which is more common in multibacillary leprosy.

**Why Each Wrong Option is Incorrect**
**Option A:** 3 years is insufficient for multibacillary leprosy follow-up, as it may not capture potential relapses or new lesions that can occur after treatment completion.
**Option C:** 10 years is excessive and not supported by current guidelines, which recommend a 5-year follow-up period for multibacillary leprosy.
**Option D:** 2 years is also insufficient, as it may not provide sufficient time to detect potential relapses or new lesions.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the follow-up period for multibacillary leprosy is directly related to the severity of the disease. Patients with multibacillary leprosy require longer follow-up periods to ensure they remain bacteriologically negative and do not develop any new disabilities.

✓ **Correct Answer:** B. 5 years