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
Compared with noble metals, base metals show 
Select and explain. 
A. Increased hardness, B. Increased ductility, C. Better biocompatibility, D. Increased density
A: Increased hardness
Answer: A: Increased hardness 
Explanation: None