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: Unknown
Which gas is most commonly used with pneumatic retinopexy - 
Select and explain. 
A. SF6, B. C3F8, C. CO2, D. N3
A: SF6
Answer: A: SF6 
Explanation: Ans. is 'a' i.c., SF6 o Sulfur hexafluoride gas (SF6) is most commonly used with pneumatic retinopexy.