Correct Answer: A

Rationale: The Snellen chart is used to test visual acuity, which assesses the function of the optic nerve responsible for vision. The other options are not related to vision; olfactory relates to the sense of smell, oculomotor controls eye movement, and trochlear controls certain eye muscles.

Correct Answer: B

Rationale: A nurse plays a crucial role in health promotion by educating clients to be effective health consumers. This involves empowering individuals to make informed decisions about their health, access appropriate healthcare services, and engage in healthy behaviors to prevent illness and promote well-being.

Correct Answer: C

Rationale: Insulin is the hormone secreted by the Islets of Langerhans in the pancreas. These specialized cells are responsible for regulating blood sugar levels by releasing insulin in response to high blood glucose levels. Insulin helps cells absorb glucose from the bloodstream, thereby lowering blood sugar levels.

Correct Answer: D

Rationale: Gloves should be worn when providing oral hygiene as it involves potential exposure to bodily fluids, aligning with the standard precautions to prevent the transmission of infections.

Correct Answer: A

Rationale: Back Care involves caring for the back through activities such as massage, exercises, proper posture, and ergonomic practices to maintain spinal health and prevent injuries. Massage helps relieve muscle tension, improve circulation, and promote relaxation, making it an effective method for back care.