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
Most characteristic Feature of lichen planus is: 
Select and explain. 
A. Thinning of nail plate is most common, B. Non scarring alopecia, C. Violaceous lesions on skin and mucous membrane, D. Wickham striae
D: Wickham striae
Answer: D: Wickham striae 
Explanation: D i.e. Wickham Striae