Most common drug used in Leprosy is:
**Core Concept**
The treatment of leprosy, also known as Hansen's disease, involves the use of antimicrobial agents to target the causative bacterium, *Mycobacterium leprae*. The primary goal is to prevent further nerve damage and disability.
**Why the Correct Answer is Right**
The most common drug used in leprosy treatment is **Dapsone**, due to its effectiveness against *M. leprae* and its relatively low cost. Dapsone works by inhibiting folate synthesis in the bacteria, ultimately leading to its death.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because while **Rifampicin** is used in leprosy treatment, it is not the most common first-line drug.
**Option B:** Incorrect as **Clofazimine** is used in multi-drug therapy for leprosy but is not the primary drug.
**Option C:** Incorrect because **Ofloxacin** may be used in certain cases but is not the most commonly used drug for leprosy.
**Clinical Pearl / High-Yield Fact**
Dapsone is a key component of multi-drug therapy for leprosy, and its use has significantly improved treatment outcomes.
**Correct Answer:** D. Dapsone.