NBDE Q - can somebody explain?

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N7CS

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  1. Dental Student
Which of the following statements describes an example of innate immunity?

A. An allergic reaction to insect venom
B. The classical pathway of complement
C. The destruction of virus-infected cells by T-killer cells
D. The production of IgG in response to insect venom
E. Phagocytosis of microbes by neutrophils and macrophages

Answer is E, but I'm not sure why B can't be an answer. I thought the complement system is a part of innate immunity?
 
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