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
Which cement base has the highest modulus of elasticity? 
Select and explain. 
A. Zinc polycarboxylate, B. Polymer reinforced ZOE cement, C. Zinc phosphate, D. Glass inomer cement
C: Zinc phosphate
Answer: C: Zinc phosphate 
Explanation: None