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: Surgery
A 50 yr old male presented with history of hematemesis - 500 ml of blood and on examination shows BP - 90/60, PR - 110/min and splenomegaly 5 below lower costal margin. Most probable diagnosis is 
Select and explain. 
A. Mallory Weiss tear, B. Duodenal ulcer, C. Gastritis, D. Poal hypeension
D: Poal hypeension
Answer: D: Poal hypeension 
Explanation: Ans. is 'd' i.e. Poal hypeension