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
Krebs cycle takes place in which layer of epithelium: 
Select and explain. 
A. Stratum corneum, B. Stratum granulosum, C. Stratum spinosum, D. Stratum basal
D: Stratum basal
Answer: D: Stratum basal 
Explanation: Because max amount of mitochondria are present in stratum basal.