What are the two primary surface proteins (antigens) of type A influenza used to classify the subtype of the viruses?
A. Neuraminidase and Hemagglutinin
B. Neuraminidase and Sialic Acid
C. Sialic Acid and Hemagglutinin
D. Hemagglutinin and Proteases
Answer: A. Neuraminidase and Hemagglutinin
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