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
[{'content': 'Krebs cycle takes place in which layer of epithelium: \nSelect and explain. \nA. Stratum corneum, B. Stratum granulosum, C. Stratum spinosum, D. Stratum basal', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Because max amount of mitochondria are present in stratum basal.', 'role': 'assistant'}]