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
OPSI is related to 
Select and explain. 
A. Kidney, B. Brain, C. Lung, D. Spleen
D: Spleen
Answer: D: Spleen 
Explanation: Overwhelming post splenectomized infection (OPSI) is seen in patient&;s who have undergone splenectomy. post splenectomized patients are more prone to infections with pneumococcal septicaemia, Neisseria meningitides, H influenza, Babesia microfti And can occur any time after splenectomy SRB 5 the edition page no.677