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USMLE-Rx Step 1 Qmax Challenge #4065

Check out today’s Step 1 Qmax Question Challenge.

Know the answer? Post it below! Don’t forget to check back for an update with the correct answer and explanation (we’ll post it in the comments section below).

The image depicts steps in an immunologic activation pathway.

This pathway is most important for which activity of the immune system?

A. Antibody production
B. Antigen presentation and destruction of intracellular pathogens
C. Defense against parasites by eosinophils
D. Immediate allergic hypersensitivity reaction
E. Neutrophil chemotaxis

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