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
Setting expansion of grey MTA when mixed with water is? 
Select and explain. 
A. 0.68%, B. 0.12%, C. 1.02%, D. 0.80%
C: 1.02%
Answer: C: 1.02% 
Explanation: None