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': 'In which of the following, Koebner phenomenon is NOT seen – \nSelect and explain. \nA. Lichen planus, B. Lichen sclerosis, C. Erythema multiforme, D. Lichen simplex chronicus', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]