This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastrointestinal tract, Subject name: Pediatrics
Most common cause of poal hypeension in children is _______ 
Select and explain. 
A. Extrahepatic compression, B. Budd chiari syndrome, C. Veno-Occlusive disease, D. Post necrotic
A: Extrahepatic compression
Answer: A: Extrahepatic compression 
Explanation: Causes of poal hypeension pre sinusoidal extrahepatic(mostcommoon):poal vein/splenic vein thrombosis,splenic AV fistula,massive splenomegaly intrahepatic:sarcoidosis,schistosomiasis,congenital hepatic fibrosis,myeloproliferative disorders,nodular degenerative hyperplasia,idiopathic poal fibrosis sinusoidal cirrhosis due to any cause post sinusoidal budd chiari syndrome,right hea failure,constrictive pericarditis,web in inferior venacava Ref : ESSENTIAL PEDIATRICS,O.P.GHAI,PG NO:289,7th edition