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': "Wickmann's straie seen in ? \nSelect and explain. \nA. Lichen planus, B. Psoriasis, C. Dermatomyositis, D. Was", 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Lichen planus", 'role': 'assistant'}]