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
Where does posterior perforation of peptic ulcer drain? 
Select and explain. 
A. Omental Bursa, B. Greater sac, C. Foramen of Winslow, D. Paracolic gutter
A: Omental Bursa
Answer: A: Omental Bursa 
Explanation: Omental Bursa REF: CSDT 11' ed p. 553 An ulcer that perforates in posterior wall of stomach drains into the lesser sac or omental bursa. Most perforated ulcers are located on the anterior wall.