This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Dermatitis, Subject name: Dental
[{'content': 'Exclamation mark hair is seen in \nSelect and explain. \nA. Alopecia areata, B. Traction alopecia, C. Trichotillomania, D. Androgen alopecia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Exclamatory mark hair are seen in alopecia areata. ref Harrison20th edition pg 1334', 'role': 'assistant'}]