Final answer:
The most common route for taking a patient's temperature is the oral route, which is considered easy, convenient, and accurate for patients who can cooperate.
Step-by-step explanation:
The most common route for taking a patient's temperature is the oral route. This is where the thermometer is placed under the tongue. It's widely used because it's easy, convenient, and accurate for cooperative patients. However, there are several other methods including rectal, axillary (under the arm), tympanic (ear), and temporal artery (forehead). The choice of method can depend on the patient's age, the situation, and available equipment.