Which instrument is used to examine the ear?

The otoscope is the correct instrument used to examine the ear. It is specifically designed to illuminate and magnify the ear canal and the eardrum, allowing healthcare professionals to thoroughly inspect for signs of infection, blockages, or other conditions affecting the ear. The design of the otoscope includes a light and a series of lenses to provide a clear view of the ear's interior anatomy.

Other instruments mentioned serve different purposes; for example, the endoscope is used for examining internal organs such as the gastrointestinal tract, making it unsuitable for ear examinations. The stethoscope is primarily utilized for listening to heart and lung sounds, and the speculum is generally used for examinations of the vaginal canal or nasal passages. Each of these tools has its specific applications in medical practice, but only the otoscope is tailored for ear examinations.