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 -
Extahepatic portal venous obstruction
Non cirrhotic portal fibrosis
Cirrhosis
Hepatic venous outflow tract obstruction