This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy of Skin, Subject name: Skin
Dermatophytes primarily involves _______: 
Select and explain. 
A. Stratum corneum, B. Stratum granulosum, C. Stratum basale, D. Stratum spinosum
A: Stratum corneum
Answer: A: Stratum corneum 
Explanation: Ans. A. Stratum corneumDermatophytes infect and survive only in the dead keratin layers of skin (stratum corneum), hair and nails as they are keratinophilic.