Psoralan ‘A’ is used in the treatment of ?
**Core Concept**
The question tests knowledge of **psoralens**, a class of photosensitizing compounds used in dermatology. Psoralens, particularly **Psoralen A**, are utilized in combination with **UVA light** for therapeutic purposes.
**Why the Correct Answer is Right**
Psoralen A is specifically used in **PUVA therapy** (Psoralen and UVA light), a treatment for various skin diseases, most notably **psoriasis** and **vitiligo**. The mechanism involves the absorption of psoralen by skin cells, which then becomes activated by UVA light, leading to cell death or modification, thereby reducing disease symptoms.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect as it's not specified, and the correct answer isn't provided to compare.
**Option B:** Without the specific answer choice, it's challenging to address directly, but typically, other options might include conditions not primarily treated with PUVA.
**Option C:** Similarly, without specifics, it's hard to directly refute, but conditions like eczema or acne might not be the primary targets for PUVA.
**Why Each Wrong Option is Incorrect** cannot be fully addressed due to missing options.
**Clinical Pearl / High-Yield Fact**
PUVA therapy is effective for certain skin diseases but comes with risks, including increased risk of **skin cancer** and **phototoxicity**. Patients undergoing PUVA must be closely monitored.
**Correct Answer:** Not provided in the query.