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 of dental stone and plaster is
respectively 
Select and explain. 
A. 0.28 and 0.6, B. 0.6 and 0. 28, C. 0.6 and 3.2, D. 0.28 and 0.98
A: 0.28 and 0.6
Answer: A: 0.28 and 0.6 
Explanation: None