This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy of skin, Subject name: Dental
Scarring alopecia is seen in - 
Select and explain. 
A. T.Capitis, B. Androgenic alopecia, C. Alopecia areata, D. Lichen planus
D: Lichen planus
Answer: D: Lichen planus 
Explanation: Causes of cicatricial alopecia: -Discoid lupus erythematosus and morphea - developmental /hereditary : aplasia cutis -traumatic, post radiation -herpes zoster and bacterial infections -lichen planopilaris - neoplastic disorders Ref Harrison20th edition pg 1234