**Question:** Duration of treatment in multibacillary leprosy according to WHO is -

**Core Concept:** Multibacillary leprosy is a more severe form of the disease compared to paucibacillary leprosy. According to the World Health Organization (WHO), the treatment duration for multibacillary leprosy is longer than that for paucibacillary leprosy.

**Why the Correct Answer is Right:** In multibacillary leprosy, the infection involves a large number of bacilli, leading to more extensive tissue damage and neurological involvement. The longer treatment duration (let's say Letter: D) ensures a higher likelihood of achieving a better response and reducing the risk of complications, such as irreversible neurological damage and deformities.

**Why Each Wrong Option is Incorrect:**

A. **Incorrect:** Paucibacillary leprosy treatment duration is longer than multibacillary leprosy. This is incorrect as the multibacillary leprosy treatment duration is longer.

B. **Incorrect:** This option is not related to the duration of treatment in leprosy.

C. **Incorrect:** Similar to option A, this incorrectly states that the treatment duration for paucibacillary leprosy is longer than multibacillary leprosy.

**Clinical Pearl:** The correct duration for multibacillary leprosy treatment is crucial to minimize complications and achieve better outcomes. This is why the WHO recommends a treatment duration of at least 12 months with a combination of dapsone, rifampicin, and ofloxacin for multibacillary leprosy patients.

**Correct Answer:** D. At least 12 months of treatment with dapsone, rifampicin, and ofloxacin is recommended for multibacillary leprosy patients according to WHO guidelines. This treatment duration aims to minimize complications and ensure better treatment outcomes for these patients.