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
[{'content': 'Exclamation mark hairs is seen in : \nSelect and explain. \nA. Alopecia areata, B. Traumatic alopecia, C. Lichen planus, D. All', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A. i.e. Alopecia areata', 'role': 'assistant'}]