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: Radiology
[{'content': 'Which layer of epithelium of oral mucous membrane is more sensitive to radiation: \nSelect and explain. \nA. Stratum spinosum, B. Stratum granulosam, C. Stratum basale, D. Stratum corneum', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]