This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, Subject name: Microbiology
[{'content': 'All are true regarding CMV except - \nSelect and explain. \nA. Double stranded DNA virus, B. Rarely causes problems in immunocompetent person, C. Foscarnet can eliminate CMV, D. Tretinitis rare when CD4 count >200/mm3', 'role': 'user'}, {'content': "Answer: C \nExplanation: Acyclovir is useful in prophylaxis but not in treatment. Ganciclovir and foscarnet have been found to be effective and are used in patients with AIDS. REF:ANANTHANARAYAN AND PANIKER'S TEXTBOOK OF MICROBIOLOGY 9TH EDITION PAGE NO:474", 'role': 'assistant'}]