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
Acute hepatocellular failure in a patient of cirrhosis of liver is precipitated by - 
Select and explain. 
A. Upper gastrointestinal bleeding, B. Large carbohydrate meal, C. Portal vein thrombosis, D. Intravenous albumin infusion
A: Upper gastrointestinal bleeding
Answer: A: Upper gastrointestinal bleeding 
Explanation: None