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: Medicine
All are predictors of 5 day treatment failure in cirrhotic patients with variceal bleeding Except? 
Select and explain. 
A. HVPG > 20 mm Hg, B. Child C status, C. Active bleeding at endoscopy, D. Prolonged prothrombin time
D: Prolonged prothrombin time
Answer: D: Prolonged prothrombin time 
Explanation: The variables most consistently found to predict 5-day treatment failure are HVPG > 20 mm Hg Child-Pugh class C Active bleeding at endoscopy Ref:Journal of Hepatology 2010