Final answer:
An oral temperature should not be taken on a resident who has eaten or had fluids in the last 10-20 minutes.
Step-by-step explanation:
An oral temperature should not be taken on a resident who has eaten or had fluids in the last 10-20 minutes. This is because eating or drinking can temporarily increase the temperature in the mouth, providing an inaccurate reading. It is recommended to wait at least 10-20 minutes after eating or drinking before taking an oral temperature for more reliable results.