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
[{'content': "A 26 year male came with hypopigmented macule over chest with scratch sign positive. Diagnosis is: \nSelect and explain. \nA. Hansen's disease, B. PKDL, C. Pityriasis alba, D. Pityriasis versicolor", 'role': 'user'}, {'content': 'Answer: D \nExplanation: 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\xa0fungal intection caused by Malassezia.', 'role': 'assistant'}]