Q: What is an immune response when provoked by a nonself particle known as?  

Answer: C

An immune response is a reaction of the body's immune system to a foreign substance, such as a virus, bacteria, or toxin. When the body is exposed to a nonself particle, it triggers an immune response, which is the body's way of defending itself. The body recognizes the nonself particle as an antigen and produces antibodies to fight it. Antibodies are proteins that recognize and bind to antigens, helping the body to destroy them.

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