This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
Most common cause of severe hematemesis in a child is – 
Select and explain. 
A. Portal hypertension, B. Peptic ulcer, C. Mallory weiss syndrome, D. None of the above
A: Portal hypertension
Answer: A: Portal hypertension 
Explanation: "Massive  hematemesis in a child is almost always due to variceal bleeding". Variceal bleeding is due to portal hypertension.