This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastro Intestinal System, Subject name: Pediatrics
Most common cause of hematemesis in children is- 
Select and explain. 
A. Extra hepatic portal vein obstruction, B. Non cirrhotic portal fibrosis, C. Veno - occlusive disease, D. Cirrhosis
A: Extra hepatic portal vein obstruction
Answer: A: Extra hepatic portal vein obstruction 
Explanation: Ans. is 'a' i.e., Extra hepatic portal vein obstruction * Variceal bleeding is the most common cause of gastrointestinal bleedIhematemesis in children.* Portal hypertension is the most common cause of esophageal variceal bleeding in children.* In children extrahepatic portal hypertension (non cirrhotic) is more common than the intrahepatic or cirrhotic portal hypertension."* Post sinusuoidal causes like Budd Chiari syndrome and veno occlusive disease are also observed but are less common.* Three most common causes of portal hypertension in children in India -i) Extrahepatic portal vein obstruction (most common)ii) Cirrhosisiii) Noncirrhotic portal fibrosis