Option D
Repeated exposure to toxins or other substances alert the body’s immune system to
develop a defensive response. This sensitization process can be initiated passively, as through the use of vaccinations, or actively through direct contact with an agent or substance in the environment.
The passive immunologic response is commonly a controlled process. An active response, on the other hand, can lead to a hypersensitivity response manifested by a simple allergic reaction or advance to an anaphylactic response.
Most initial contacts may manifest with disturbing or annoying symptoms such as a skin rash. Repeated exposures or an increase in the intensity of the substance can lead suddenly to an anaphylactic response.
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