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
A 20 year old male has presented with repeated episodes of hematemesis. There is no history of jaudice or liver decompensation. On examination the significant findings include splenomegaly (8 cms below costal margin), and presence of esophageal varices. There is no ascites or peptic ulceration. The liver function tests are normal. The most likely diagnosis is - 
Select and explain. 
A. Extahepatic portal venous obstruction, B. Non cirrhotic portal fibrosis, C. Cirrhosis, D. Hepatic venous outflow tract obstruction
B: Non cirrhotic portal fibrosis
Answer: B: Non cirrhotic portal fibrosis 
Explanation: None