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: Dental
[{'content': 'Vitiligo vulvar is the best treatment is – \nSelect and explain. \nA. PUVA, B. Steroids, C. Coaltar, D. All', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Photochemotherapy with psoralens with UVA exposure (PUVA) forms the mainstay of therapy in vitiligo".\n"Despite the development in phototherapy, PUVA and PUVA SOL still remain the mainstay of therapy".', 'role': 'assistant'}]