This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Transplantation, Subject name: Surgery
Most common organism involving allograft transplant: 
Select and explain. 
A. Bacteria, B. Fungi, C. Virus, D. Parasite
C: Virus
Answer: C: Virus 
Explanation: Ans. (c) VirusesRef: Bailey 26th edition, Page 1415* Most common infection in allograft transplant--Viral infection* Risk of infection is the greatest during first 6 months* Chemoprophylaxis is important for high-risk patients* Cytomegalovirus is a major problem* Most common malignancy after transplant: Post-transplant lymphoproliferative disorder > skin cancers (squamous cell cancer)