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: Dental
[{'content': 'The given below sign is present in \nSelect and explain. \nA. Lichen planus, B. Atopic dermatitis, C. Drug eruptions, D. Contact dermatitis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The above shows the presence of "Dermatographism" where skin blanching is seen whenever it is stroked with a blunt object. This is a classical feature of Atopic dermatitis.', 'role': 'assistant'}]