This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Histopathological findings, Subject name: Dental
Lichenification occurs in which layer of skin: 
Select and explain. 
A. Stratum lucidum, B. Stratum corneum, C. Stratum granulosum, D. Stratum malpighii
D: Stratum malpighii
Answer: D: Stratum malpighii 
Explanation: Lichenification is seen in Stratum malpighii (stratum Spinosum along with stratum basale) LICHENIFICATION- Thickening of the epidermis (and to some extent also of the dermis) in response to prolonged rubbing. It is a secondary skin hyperophy ; thick, leathery skin, giving the skin a leathery bark-like appearance. It is a common consequence of atopic dermatitis;eczema and other pruritic disorders. Associated with acanthosis( thickening of stratum spinosum)