This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
Psoralen–A is used in the treatment of : 
Select and explain. 
A. Pemphigus, B. Vitiligo, C. Pityriasis alba, D. Ichthyosis
B: Vitiligo
Answer: B: Vitiligo 
Explanation: Psoralens (like trioxsalen and methoxsalen) along with UV-A are used to induce pigmentation in vitiligo.