This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General, Subject name: Skin
Hyperkeratosis is: 
Select and explain. 
A. Thinning of Stratum corneum, B. Thickening of stratum corneum, C. Thinning of stratum basale, D. Thickening of stratum basale
B: Thickening of stratum corneum
Answer: B: Thickening of stratum corneum 
Explanation: Ans. (b) Thickening of stratum corneumRef: Fitzpatrick 7th ed. / 384