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
[{'content': 'Green endo ice refers to: \nSelect and explain. \nA. 1,1,1,2-Tetraflueroethane., B. Temperature is -26.2degree celcius., C. Both AB, D. Temperature is-41degree celcius.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]