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Which of the following best describes an example of a nonspecific external response to infectious agents?
A: Phagocytes consume infectious agents through the process of endocytosis.
B: The presence of infectious agents causes inflammation and swelling in localized areas.
C: Sweat creates an acidic environment, which inhibits growth of infectious agents.
D: Memory B cells recognize infectious agents and destroy them before they can enter the body.

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Milliecartier
Keyword on this question would be external so while A is biologically correct, it happens internally so it's wrong. Inflammation and swelling occurs below skin surface so internal as well. C is an external response while D is also internal. So your answer would be C

Ans. Option (C).

Non-specific immune responses include immune responses, which are same for all pathogens. Immune cells or components that elicit non-specific immune responses may internal (such as neutrophils and macrophages) and external (such as tears, saliva, and sweat).

Sweat glands secrete sweat that provides an acidic environment onto the skin that slows down the growth of pathogens and shows an non-specific external response.

Thus, the correct answer is option (C).