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: Surgery
A 42 year old company executive presents with sudden upper GI bleed (5 litres) of bright red blood, with no significant previous history. The diagnosis is? 
Select and explain. 
A. Oesophageal varices, B. Duodenal ulcer, C. Gastritis, D. Gastric erosion
B: Duodenal ulcer
Answer: B: Duodenal ulcer 
Explanation: Ans. is 'b' i.e., Duodenal ulcer Both esophageal varices and duodenal ulcer are causes of massive upper GI bleed. Although it is difficult to reach a diagnosis by clinical history and physical examination alone, variceal bleed is less likely as there are no stigmata of chronic liver disease or poal hypeension.