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: Skin
Lichenisation occurs in which layer of skin? 
Select and explain. 
A. Stratum malpighi, B. Stratum corneum, C. Stratum lucidum, D. Stratum granulosum
A: Stratum malpighi
Answer: A: Stratum malpighi 
Explanation: Ans. is 'a' i.e., Stratum malpighi