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': "Koebner's phenomenon is seen in following except- \nSelect and explain. \nA. Erythema, B. Scleromyxedema, C. Molluscum contagiosum, D. Darrier's disease", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]