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: Skin
[{'content': 'Vitiligo vulvaris, best treatment is : \nSelect and explain. \nA. PUVA, B. Steroids, C. Coaltar, D. All', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A. ie. PUVA', 'role': 'assistant'}]