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 – a) Lichen planusb) Wartsc) Bechet syndromed) Psoriasise) Viggo \nSelect and explain. \nA. bce, B. abde, C. abcd, D. acde", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]