单选题：When someone has flu-like illness, why will a swab be taken

题目内容：
When someone has flu-like illness, why will a swab be taken in the nose and sent to the lab A．To find more infections than under normal circumstances．
B．To examine if it is influenza or swine flu．
C．To see if the illness is serious．
D．To stop the illness spread to other areas．

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