Provide your best answer for the following question. Give ONLY the answer, no other words or explanation.
For example:

Answer: <most likely answer, as short as possible; not a complete sentence, just the answer!>.

The question is: A fever is a response to a disease-causing agent infecting the body. Raising one's body temperature changes the shape of enzymes in the agent so it cannot reproduce. Which statement best describes a fever?
A fever is an internal response to an internal stimulus.
A fever is the body's response to infection, raising its temperature to change the shape of enzymes in the agent and prevent reproduction.