The integumentary system is an example of adaptive or active immunity. Thus, the correct option is A.
What is the Integumentary system?
The integumentary system may be defined as the groups or organs that are produced on the outermost layer of an animal's body. It includes the skin, its appendages, and its receptors.
The skin has elements of both innate and adaptive immunity. In which innate is non-specific while adaptive is specific.
Therefore, the integumentary system is an example of adaptive or active immunity. Thus, the correct option is A.
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