Multiple Choice
Suppose that the figure below 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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