This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neutrophilic Dermatoses, Subject name: Skin
[{'content': 'A child scratches his hand with a pen. A red wheel appears which persists for 30 minutes. What would be the diagnosis? \nSelect and explain. \nA. Contact urticaria, B. Dermographism, C. Pressure urticaria, D. Atopy', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. b. DermographismWhite dermographism is seen in atopic dermatitisDermographism is seen in urticaria', 'role': 'assistant'}]