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: Pathology
Psoralane Ultra Violet A (PUVA) therapy is advised in 
Select and explain. 
A. Pemphigus vulgaris, B. Apthous ulcers, C. Carcinoma in situ, D. ANUG
A: Pemphigus vulgaris
Answer: A: Pemphigus vulgaris 
Explanation: According to Rook and Colleagues the extra corporeal photochernotherapy for drug resistant pemphigus vulgaris include administration of 8-methoxypsoralen followed by exposure of peripheral blood to ultraviolet radiation. It is also used for vitiligo and graft versus host disease.