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
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: 
Select and explain. 
A. Pityriasis versicolor., B. Indeterminate leprosy, C. Pityriasis alba, D. Acrofacial vitiligo
C: Pityriasis alba
Answer: C: Pityriasis alba 
Explanation: .