<prompt>  A 20 year old male has presented with repeated episodes of hematemesis. There is no history of jaundice 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 obstructionNon cirrhotic portal fibrosisCirrhosisHepatic venous outflow tract obstruction 