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
Biocompatibility is best for: 
Select and explain. 
A. Beta-titanium, B. Stainless steel, C. Nitinol, D. Base metal alloys
A: Beta-titanium
Answer: A: Beta-titanium 
Explanation: None