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': 'Ideal requisites of barrier membrane include all of the following except \nSelect and explain. \nA. Cell occlusivity, B. Tissue compatibility, C. Space making, D. Biodegradable', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]