This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Anatomy
A 42-year-old 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: 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. REF - Bailey and love 27e Stomach and duodenum p1128