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
Water powder ratio for class IV stone is: 
Select and explain. 
A. 0.22-0.24, B. 0.24-0.28, C. 0.65-0.70, D. 0.45-0.50
A: 0.22-0.24
Answer: A: 0.22-0.24 
Explanation: None