This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Retina, Subject name: Ophthalmology
Which of the following is not a prerequisite for performing pneumatic retinopexy: 
Select and explain. 
A. Fresh retinal detachment, B. Inferior retinal detachment, C. No air travel, D. Pt should be able to maintain position
B: Inferior retinal detachment
Answer: B: Inferior retinal detachment 
Explanation: Superior retinal detachment is an indication of pneumatic retinopexy not inferior. Rx of RD PNEUMATIC RETINOPEXY * Gases provide tamponade. * Air is shoest acting, SF6 is long acting and C3F8 is longest acting. * Indication: -Recent onset RD -RRD -Superior break -Single break - Patient should be able to maintain the stable position. Contraindicated in old debilitated patients, mentally unstable patients