**Question:** DOC for lepra II reaction is –

A. Dapsone
B. Clofazimine
C. Rifampicin
D. Streptomycin

**Core Concept:**

Leprosy, caused by Mycobacterium leprae or M. leprae, is a chronic granulomatous infection primarily affecting the skin, peripheral nerves, eyes, and upper respiratory tract. Lepra reactions occur due to an immune system response against the bacteria and are classified as Type 1 (Erythema Nodosum Leprosum - ENL) and Type 2 (Reversal Reaction) reactions.

**Why the Correct Answer is Right:**

Lepra II reaction, specifically ENL (Erythema Nodosum Leprosum), is characterized by a delayed-type hypersensitivity response, leading to skin lesions and systemic manifestations. Dapsone (A) is a key drug in the management of ENL reactions due to its immunosuppressive properties, anti-inflammatory actions, and its ability to reduce bacterial load in leprosy lesions.

**Why Each Wrong Option is Incorrect:**

1. Clofazimine (B) is primarily used in the treatment of leprosy as a bacteriostatic agent against M. leprae and M. lepromatosis. Although it may be used in Type 1 reactions, it is not the primary choice for Type 2 reactions like ENL.
2. Rifampicin (C) is an antibiotic used against mycobacterial infections, particularly M. tuberculosis. It is not specifically indicated for managing leprosy reactions.
3. Streptomycin (D) is an aminoglycoside antibiotic used primarily against M. tuberculosis and M. leprae infections. It is not the primary drug for leprosy reactions.

**Clinical Pearl:**

In ENL reactions, a combination of Dapsone (A) and prednisolone (a corticosteroid) is the preferred treatment approach due to their synergistic effects on reducing inflammation, suppressing the immune response, and controlling the disease process. This combination helps to manage the symptoms and reduce the risk of permanent disability in leprosy patients.