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: Anatomy
[{'content': 'The functions of simple squamous epithelium includes all except \nSelect and explain. \nA. Exchange, B. Lubrication, C. Barrier, D. Secretion', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Major functions of simple squamous epithelium includes\n\nExchange, barrier in CNS \nExchange and lubrication \nBarrier', 'role': 'assistant'}]