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
Exclamation mark hairs is seen in : 
Select and explain. 
A. Alopecia areata, B. Traumatic alopecia, C. Lichen planus, D. All
A: Alopecia areata
Answer: A: Alopecia areata 
Explanation: A. i.e. Alopecia areata