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
Ideal requisites of barrier membrane include all of the following except 
Select and explain. 
A. Cell occlusivity, B. Tissue compatibility, C. Space making, D. Biodegradable
D: Biodegradable
Answer: D: Biodegradable 
Explanation: None