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
Lichenisation occurs in which layer of skin­- 
Select and explain. 
A. Stratum malpighi, B. Stratum corneum, C. Stratum hucidum, D. Stratum granulosum
A: Stratum malpighi
Answer: A: Stratum malpighi 
Explanation: The Malpighian layer of the skin is generally defined as both the stratum basale and stratum spinosum as a unit, although it is occasionally defined as the stratum basale specifically,or the stratum spinosum specifically.
It is named after Marcello Malpighi