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
All of the following are non bone graft material except: 
Select and explain. 
A. Sclera, B. Cartilage, C. Calcium phosphate biomaterial, D. Bio oss
D: Bio oss
Answer: D: Bio oss 
Explanation: None