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: Medicine
The commonest cause of massive upper GIT bleeding is: 
Select and explain. 
A. Peptic ulcer, B. Erosive gastritis, C. Gastric carcinoma, D. Varices
A: Peptic ulcer
Answer: A: Peptic ulcer 
Explanation: None