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. Poal hypetension, B. Peptic ulcer, C. Mallory weiss syndrome, D. None of the above
A: Poal hypetension
Answer: A: Poal hypetension 
Explanation: Ans. is 'a' i.e., Poal hypeension "Massive hematemesis in a child is almost always due to variceal bleeding". Variceal bleeding is due to poal hypeension.