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
A 26 year male came with hypopigmented macule over chest with scratch sign positive. Diagnosis is: 
Select and explain. 
A. Hansen's disease, B. PKDL, C. Pityriasis alba, D. Pityriasis versicolor
D: Pityriasis versicolor
Answer: D: Pityriasis versicolor 
Explanation: Hypopigmented patch over chest and trunk with fine scaling and scratch sign positive (i.e appearance of scales on scratching ) is suggestive of Pityriasis versicolor which is a fungal intection caused by Malassezia.