Which of the following best describes an otoscope?

An otoscope is specifically designed for examining the ear, making the choice correct. This instrument allows healthcare professionals to visualize the ear canal and the eardrum, enabling them to assess for conditions like infections, blockages, or other abnormalities in the ear. The design typically includes a light source and a magnifying lens, which enhance the ability to see these structures in detail.

The other options describe instruments that serve different purposes. For example, blood pressure measurement is accomplished with a sphygmomanometer, while temperature measurement is done with a thermometer. An instrument used for examining the throat typically refers to a laryngoscope or a tongue depressor, none of which relate to ear examination. Therefore, the choice highlighting the otoscope's role in ear examination is the most accurate and relevant in this context.