This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pathology
[{'content': 'A 5 year old boy has multiple asymptomatic oral and circular faintly hypopigmented macules with fine scaling on his face. The most probable clinical diagnosis is: \nSelect and explain. \nA. Pityriasis versicolor., B. Indeterminate leprosy, C. Pityriasis alba, D. Acrofacial vitiligo', 'role': 'user'}, {'content': 'Answer: C \nExplanation: .', 'role': 'assistant'}]