This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fungal infections, Scabies, Pediculosis, Subject name: Dental
Skin scrapping & KOH mounting is done for - 
Select and explain. 
A. Leprosy, B. Varicella, C. Fungus, D. HSV
C: Fungus
Answer: C: Fungus 
Explanation: Skin scraping and koh mount is used to demonstrate superficial fungal infections caused by dermatophytes and yeasts. after the material obtained from scrapings it is placed on a glass slide containing 10-30% koh and covered by cover slip. fungal elements resist digestion by koh as they contain chitin. dermatophytes appear as translucent nonpigmented spectate mycelia or ahrospores candida appear as budding yeast cells with pseudohyphae pityriasis versicolor appear as sphagetti and meat ball appearance. iadvl textbook of dermatology page 272