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: Anatomy
[{'content': 'Lesser sac of stomach is bounded by: \nSelect and explain. \nA. Posterior wall of stomach, B. Visceral surface of spleen, C. Under surface of liver, D. All', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A. i.e. Posterior wall of stomach - Lesser sac/ Omental bursa is bounded anteriorly by stomach, caudate lobe of liver, lesser omentum & greater omentum (ant. 2 layers); and posteriorly by structures forming stomach bed (i.e. diaphragm, pancreas, spleen etc) & greater omentum (posterior 2 layers) Lesser sac or omental bursa is the site for abscess formation in posterior perforation of gastric ulcer and internal hernia through epiploic foramen', 'role': 'assistant'}]