Multiple Choice
The figure shows the concentration of antibodies for an antigen produced by Clostridium tetani, a bacterium that causes tetanus. What could trigger the increase in antibody production marked by the arrow?
A) a decrease in antigen concentration
B) an increase in histamine production
C) an initial exposure to Pseudomonas aeruginosa, a bacterium that causes pneumonia
D) a second exposure to Clostridium tetani
Correct Answer:

Verified
Correct Answer:
Verified
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