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: Microbiology
[{'content': 'True statement about influenza A virus: \nSelect and explain. \nA. It has a double stranded segmented RNA, B. Pandemics are caused by antigenic drifts, C. Nucleocapsid antibody is not specific, D. Hemagglutinin and neuraminidase are strain specific', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]