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: Gynaecology & Obstetrics
Media commonly used for distension in hysteroscopy is: September 2011 
Select and explain. 
A. Oxygen, B. Carbon dioxide, C. Nitrous oxide, D. Hydrogen
B: Carbon dioxide
Answer: B: Carbon dioxide 
Explanation: Ans. B: Carbon dioxide The media in common usage for hysteroscopy include carbon dioxide gas delivered through the hysteroflator at a maximum rate of 70 ml/ min and pressure less than 100 mm Hg