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: Anaesthesia
All anesthetic agent decrease poal vein flow. Poal flow is maximally reduced by: 
Select and explain. 
A. Ether, B. Halothane, C. Isoflurane, D. Enflurane
B: Halothane
Answer: B: Halothane 
Explanation: B i.e. HalothaneAll volatile anesthetic agents reduce poal hepatic blood flow. This decrease is greatest with halothane and least with isofluraneQ.