This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Anatomy
The sengstaken tube must be maintain a pressure of _______ to stop bleeding from varices 
Select and explain. 
A. 20mmHg, B. 25mmHg, C. 35mmHg, D. 45mmHg
C: 35mmHg
Answer: C: 35mmHg 
Explanation: If bleeding doesn't stop promptly, the gastric balloon may be inflated to atleast a volume of 300ml, or the esophageal balloon may be inflated to a pressure of 40mmHg Ref: Sabiston 20th edition Pgno : 1438