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': "'Fir-tree' type of distribution is seen in? \nSelect and explain. \nA. Pityriasis Rosea, B. Psoriasis, C. Measles, D. Secondary syhilis", 'role': 'user'}, {'content': 'Answer: A \nExplanation: A. i.e. Pityriasis rosea', 'role': 'assistant'}]