This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Poal Hypeension, Subject name: Surgery
Normal poal vein pressure is: 
Select and explain. 
A. <3 mm Hg, B. 3-5 mm Hg, C. 5-10 mm Hg, D. 10-12 mm Hg
C: 5-10 mm Hg
Answer: C: 5-10 mm Hg 
Explanation: Poal Pressure Normal Poal vein pressure: 5-10 mm Hg Variceal formation occurs when poal pressure is >10 mm Hg Variceal bleeding occurs when poal pressure is >12 mm Hg.