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
A male is presenting with a violaceous papule which is pruritic. There is pterygium of nail with cicatracial alopecia. Diagnosis is – 
Select and explain. 
A. Psoriasis, B. Pityriasis rosea, C. Lichen planus, D. Seborrheic dermatitis
C: Lichen planus
Answer: C: Lichen planus 
Explanation: Information we got :-


Lesion is pruritic
No scales
Violaceous papule
Pterygium of nail
Cicatracial alopecia


All are seen in Lichen planus.