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
Babloo around 5 to 10 year boy presents with multiple small hypopigmented scaly macule patch on cheek. Some of his classmates also have similar lesions. The most probable diagnosis is 
Select and explain. 
A. Pityriasis rosea, B. Pityriasis versicolour, C. Indeterminate leprosy, D. Pityriasis alba
D: Pityriasis alba
Answer: D: Pityriasis alba 
Explanation: D i.e. Pityriasis alba