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': 'A 5 year boy has recurrent multiple asymptomatic oval and circular faintly hypopigmented macules with fine scaling on his face. The most probable clinical diagnosis is: \nSelect and explain. \nA. Ptyriasis versicolor, B. Indeterminate leprosy, C. Ptyriasis alba, D. Acrofacial vitiligo', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Ptyriasis alba', 'role': 'assistant'}]