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15 November, 17:32

What causes asthma?

A. Bacteria that are resistant to antibiotics infect the body.

B. Particular antigens trigger muscle contractions that make it difficult to breathe.

C. Antibodies and cytotoxic T cells attack cells in the tissues of the lungs.

D. Mosquito-borne pathogens enter the bloodstream.

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  1. 15 November, 17:56
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    My teacher once told me it was C.
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