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': 'Vitamin D analogue calcitriol is useful in the treatment of \nSelect and explain. \nA. Lichen Planus, B. Psoriasis, C. Phemphigus, D. Leprosy', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B. i.e. Psoriasis', 'role': 'assistant'}]