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': "All of the following regarding Lichen planus are true except: \nSelect and explain. \nA. Does not involve mucous membrane, B. Associated with Hepatitis 'C, C. Topical steroid are the mainstay of therapy, D. Spontaneous remissions 6mo to 2 years", 'role': 'user'}, {'content': 'Answer: A \nExplanation: A. i.e. Does not involve mucous membrane', 'role': 'assistant'}]