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
Skin scraping & KOH mounting is done for 
Select and explain. 
A. Fungus, B. Leprosy, C. Varicella, D. HSV
A: Fungus
Answer: A: Fungus 
Explanation: 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.