This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Benign Gastric Disease, Subject name: Surgery
Most common cause of GI bleed is - 
Select and explain. 
A. Duodenal ulcer, B. CA stomach, C. Oesophageal varices, D. Erosive gastritis
A: Duodenal ulcer
Answer: A: Duodenal ulcer 
Explanation: Ans. is 'a' i.e., Duodenal ulcer o Peptic ulcer disease is the most common cause of severe UGIB, accounting for upto 50% of cases.