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: Surgery
All of the following predispose to squamous cell carcinoma, EXCEPT - 
Select and explain. 
A. Lichen planus of mouth, B. Bowen's disease, C. Inverted papilloma of nose, D. Chronic irritation of oral mucosa by jagged teeth
A: Lichen planus of mouth
Answer: A: Lichen planus of mouth 
Explanation: None