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
[{'content': 'Infection of all the following structures can be cause of Psoas abscess except- \nSelect and explain. \nA. Vertebrae, B. Appendix, C. Hip joint, D. Ribs', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]