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': 'Hanging curtain sign is seen in \nSelect and explain. \nA. Ptyriasis alba, B. Pitriasis versicolor, C. Pityriasis rosea, D. Pitriasis miliaris', 'role': 'user'}, {'content': 'Answer: C \nExplanation: A skin rash that sometimes begins as a large spot on the chest, abdomen or back, followed by a pattern of smaller lesions.', 'role': 'assistant'}]