challenge: What benefit does a randomized study show regarding the timing of Transjugular intrahepatic portosystemic shunt (TIPS) procedure after bleeding from esophageal or gastric varices?
  
  A. Improved survival if done within 48 hours
  B. Improved survival if done within 72 hours
  C. Improved survival if done within 96 hours
  D. Improved survival if done within 24 hours
  Answer: 