Fever: a. May be helpful when the body temperature is slightly elevated enhancing metabolism and body repair.
b. Can be beneficial when the body temperature is greater than 5 degrees above normal since enzyme activity is compromised.
c. Occurs when pyrogens reset the hypothalamic thermostat to a lower setting.
d. Decreases the metabolic rate to slow bacterial growth

a. May be helpful when the body temperature is slightly elevated enhancing metabolism and body repair.

Explanation:

Fever may be helpful when the body temperature is slightly elevated enhancing metabolism and body repair and it does this by speeding up metabolism of the adaptive and innate immune system which helps in the repair of cells of the body.

Fever occurs when pyrogens reset the hypothalamic thermostat to a higher setting.

the correct answer is a