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
10 year old chid has violaceous papule and pterygium of nails. The diagnosis is 
Select and explain. 
A. Psoriasis, B. Pemphigus, C. Pemphigoid, D. Lichen Planus
D: Lichen Planus
Answer: D: Lichen Planus 
Explanation: D i.e. Lichen planus