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: Unknown
[{'content': 'The policeman of the abdomen is - \nSelect and explain. \nA. Peritoneum, B. Greater omentum, C. Appendice epiloicae, D. Teania coli', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans: B', 'role': 'assistant'}]