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Some of the dust particles are not expelled by sneeze and make their way further down the respiratory tract but not yet into the alveolar space. Here their elimination is the job of which of the following?

(A) Released granular contents of your granulocytes.
(B) The low pH of the environment.
(C) The physical barrier produced by hairs.
(D) Mucus joint with movement of cilia of lining cells

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