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29 April, 05:30

An allergic response is NOT typically caused by

A. Harmless antigens

B. Pollen

C. Histamine

D. Both A and C

I'm conflicted because histamine causes the physical response but pollen and harmless antigens cause histamine

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  1. 29 April, 09:29
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    I think the answer is D. Both a and b
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