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
A 60 year old male patient wants rehabilitation of missing teeth. Intra-oral examination reveals upper and lower edentulous arches. The casts were mounted using impression plaster. The W/P ratio for this gypsum product is- 
Select and explain. 
A. 0.50-0.75, B. 0.45-0.50, C. 0.28-0.30, D. 0.22-0.24
A: 0.50-0.75
Answer: A: 0.50-0.75 
Explanation: None