Ramu,a 8 yrs old boy presents with upper GI bleeding.On examination,he is found to have splenomegaly;there are no signs of ascites,or hepatomegaly;esophageal varices are found on UGIE.Most likely diagnosis is:

• A. Non cirrhotic portal fibrosis
• B. Budd chiari syndrome
• C. Veno-occlusive disease
• D. Cirrhosis