Which of the following is not a method for taking temperature?

The reason why the given answer is correct lies in the distinction between types of temperature-taking methods and the terminology used. Aural, oral, and axillary are all recognized methods of measuring body temperature that refer to specific locations on the body.

Aural temperature measurement is performed using an infrared device in the ear, oral temperature is taken by placing a thermometer in the mouth, and axillary temperature is measured in the armpit. Each of these methods has its own specific procedures and is used in varying clinical scenarios.

On the other hand, the term "digital" does not refer to a specific method of taking temperature but rather describes the type of thermometer used. Digital thermometers can be used in oral, axillary, or rectal measurements, which means it acts as a tool rather than a distinct method. Therefore, while digital thermometers may be common in practice, the method itself—how and where to take the temperature—is defined by the other options listed. This distinction clarifies why 'digital' stands out as not being a method for taking temperature in this context.