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
Site of transplantation in Islet cell transplant for diabetes mellitus 
Select and explain. 
A. Forearm muscles, B. Pelvis, C. Thigh, D. Injected into the portal vein
D: Injected into the portal vein
Answer: D: Injected into the portal vein 
Explanation: • The islets are then purified from the dispersed tissue by density-gradient centrifugation and can be delivered into the recipient liver (the preferred site for transplantation) by injection into the portal vein.