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
Koebner's phenomenon is characteristic of 
Select and explain. 
A. Psoriasis, B. Pemphigus vulgaris, C. Pityriasis rosea, D. Lupus vulgaris
A: Psoriasis
Answer: A: Psoriasis 
Explanation: A i.e. Psoriasis