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
All of the following regarding Lichen planus are true except: 
Select and explain. 
A. 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
A: Does not involve mucous membrane
Answer: A: Does not involve mucous membrane 
Explanation: A. i.e. Does not involve mucous membrane