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
In dental composite 75 % by weight filler is approximately what % volume of filler? 
Select and explain. 
A. 85, B. 90, C. 60, D. 50
D: 50
Answer: D: 50 
Explanation: None