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: Unknown
[{'content': 'Most common infection occurs in transplant recipients: \nSelect and explain. \nA. Cytomegalo virus, B. Epstein Barr virus, C. Hepatitis virus, D. Polyoma virus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref. Textbook of Microbiology and Immunology BY Parija. Page. 487\n\xa0\nMost common infection is CMV.\nBelow is the table of the infections in transplant recipients (Very important from Harrisons)', 'role': 'assistant'}]