Answer :
Final answer:
The normal oral body temperature is 98.6 °F, which is the setpoint that the body tries to maintain within a small fluctuation range.
Explanation:
The normal body temperature taken orally is typically considered to be 98.6 °F (37.0 °C). This temperature can fluctuate throughout the day, with normal variations accounting for about 0.5 °C. The body works to maintain a setpoint for temperature, and while the body's temperature can safely range between 97.7 °F and 99.5 °F (36.5 - 37.5 °C), the average setpoint is 98.6 °F. Therefore, the correct answer to the question is b. 98.6 °F.