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
A 30 year old male present with pruritic flat-topped polygonal, shiny violaceous papules with flexural distribution. the most likely diagnosis is? 
Select and explain. 
A. Psoriasis, B. Pityriasis, C. Lichen planus, D. Lichenoid dermatitis
C: Lichen planus
Answer: C: Lichen planus 
Explanation: C. i.e. Lichen planus