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
Green endo ice refers to: 
Select and explain. 
A. 1,1,1,2-Tetraflueroethane., B. Temperature is -26.2degree celcius., C. Both AB, D. Temperature is-41degree celcius.
C: Both AB
Answer: C: Both AB 
Explanation: None