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': 'The mainstay of treatment of vitiligo is? \nSelect and explain. \nA. PUVA, B. Imiqinod, C. Acyclovir, D. Coal tar', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., PUVA", 'role': 'assistant'}]