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
[{'content': 'Most common organism involving allograft transplant: \nSelect and explain. \nA. Bacteria, B. Fungi, C. Virus, D. Parasite', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 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)', 'role': 'assistant'}]