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
[{'content': 'Most common cause of hematemesis in children is- \nSelect and explain. \nA. Extra hepatic portal vein obstruction, B. Non cirrhotic portal fibrosis, C. Veno - occlusive disease, D. Cirrhosis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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', 'role': 'assistant'}]