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
In alopecia areata,seen is - 
Select and explain. 
A. Exclamation mark hair, B. Scarring, C. Fungal infection, D. Traumatic
A: Exclamation mark hair
Answer: A: Exclamation mark hair 
Explanation: Alopecia areata is characterized by exclamation mark hairs. In this hairs fracture at their distal end and taper proximally to a pencil point giving them the appearance of an exclamation mark Page 240 Ref Harrison20th edition pg 1234