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: Skin
[{'content': "Koebner's phenomenon is seen in all of the following conditions, EXCEPT: \nSelect and explain. \nA. Lichen planus, B. Ichthyosis, C. Psoriasis, D. Pemphigus", 'role': 'user'}, {'content': "Answer: B \nExplanation: Koebner's phenomenon refers to development of morphologically identical lesions in the traumatized uninvolved skin of the patients who have cutaneous diseases. It is also known as isomorphic phenomenon. Conditions associated with Koebner's phenomenon are: Was Molluscum contagiosum Autoimmune (vitiligo) Psoriasis Pemphigus Lichen planus Ref: An Aid to the MRCP: Essential Lists, Facts and Mnemonics By Nicholas Boeckx, page 184.", 'role': 'assistant'}]