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': 'Skin scraping & KOH mounting is done for \nSelect and explain. \nA. Fungus, B. Leprosy, C. Varicella, D. HSV', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Skin scrapping and KOH mount is done for fungal infection. Fungus is easily detected using low power objective lens with Iris diaphragm closed and condensor positioned down.', 'role': 'assistant'}]