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
The water powder ratio of alginate is: 
Select and explain. 
A. 100 ml of water to 60 gms of powder, B. 40 ml of water to 40 gms of powder, C. 40 ml of water to 15 gms of powder, D. 15 ml of water to 40 gms of powder
C: 40 ml of water to 15 gms of powder
Answer: C: 40 ml of water to 15 gms of powder 
Explanation: None