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: Surgery
Imfection of all the following structures can be cause Psoas Abscess except 
Select and explain. 
A. Veebrae, B. Appendix, C. Hip joint, D. Ribs
D: Ribs
Answer: D: Ribs 
Explanation: Abscess in the psoas region in the iliac fossa, is commonly due to tuberculosis of spine (T 10) and lymph nodes, retroperitoneal structures, lower intercostal region. * It can also be a pyogenic abscess. Clinical Features * Back pain, fever, spinal tenderness, para spinal spasm and restricted spine movement. ref:SRB&;S manual of surgery,ed 3,pg no 651