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': "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 steroids are the mainstay of therapy, D. Spontaneous remission occurs after 6months to 2 years", 'role': 'user'}, {'content': "Answer: A \nExplanation: Mucous membranes are commonly involved especially of oral mucosa, and less commonly of genital tract.\nHepatitis 'C' and chronic active hepatitis have been implicated for the causation of Lichen planus.\nTopical steroids are the first line of treatment.\nLesions of Lichen planus heal spontaneously in 6 months to 2 years, leaving behind hyperpigmentation.", 'role': 'assistant'}]