This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Which of the following is the most common complication of immunosuppression 
Select and explain. 
A. Graft rejection, B. Malignancy, C. Thrombocytopenia, D. Infection
D: Infection
Answer: D: Infection 
Explanation: Immunosuppressive therapy impairs the protective response to both malignancy and infection. Consequently, pre-existing malignancy is an absolute contraindication and, even after curative treatment, transplantation should not usually be considered for at least 3 years. Similarly, the presence of active infection is a contraindication to transplantation In immunosupressive states , infection is the most common complication due to weakened immune systems . Ref Bailey and love 27e Transplantations chapter p1541