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
Elastomers except POLYETHER are 
Select and explain. 
A. Hydrophilic, B. Hydrophobic, C. Water loving impression materials, D. Potassium alginates
B: Hydrophobic
Answer: B: Hydrophobic 
Explanation: None