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': 'Following is a type of physical uicaria - \nSelect and explain. \nA. Dermographism, B. Uicaria pigmenthosa, C. Uicaria vasculitis, D. Auto-immune uicaria', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Dermographism:-Type of physical uicaria- induced by mechanical stimulus also called as Skin writing Rapid appearence of wheal flare at the site of brisk firm stroke made with a firm object.Lesions are often linear/ assume the shape of eliciting stimulus.Local erythema followed by edema.Most common physical uicaria seen in young adults sometimes symptomatic pruritus is present before the onset of lesions IADVL textbook of dermatology, cutaneous vascular responses, page 661', 'role': 'assistant'}]