This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
[{'content': 'What virus is noted for such a high incidence of antigenic drift that more than one antigenic variant can be isolated from infected individuals? (NOT RELATED) \nSelect and explain. \nA. Adenovirus, B. Herpesvirus, C. HIV, D. Influenza Virus', 'role': 'user'}, {'content': 'Answer: C \nExplanation: HIV is famously known for its antigenic drift b/c HIV is poor at proofreading and hence more than one antigenic types can be isolated from a patient at the same time.Influenza is also known for its antigenic drift, but this antigenic change occurs over a period of 2-3 yrs.', 'role': 'assistant'}]