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
Principal cause of death in renal transplant patients? 
Select and explain. 
A. Uremia, B. Malignancy, C. Rejection, D. Infection
D: Infection
Answer: D: Infection 
Explanation: Ans. is 'd' i.e. Infection Principal causes of death in renal transplant patients (in decreasing order) - Hea disease - Infection - Stroke