This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Medicine
A man presents with history of hemetemesis of about 500ml of blood. On examination, spleen is palpable 5 cms below the left costal margin. The most likely diagnosis is - 
Select and explain. 
A. Poal Hypeension, B. Gastric ulcer, C. Drug induced, D. Mallory Weiss Tear
A: Poal Hypeension
Answer: A: Poal Hypeension 
Explanation: <p>Davidson&;s principles and practice of medicine 22nd edition. *The clinical features results from poal venous congestion and collateral vessels formation .Splenomegaly is the cardinal finding .spleen is rarely enlarged more than 5 cm below the left costal margin in adults . # collateral vessal formation occurs in oesophagus and stomach causing hemetemesis.</p>