Correct Answer: B

Rationale: The presence of red blood cells in the urine is a significant finding that can indicate nephrotoxicity, a potential adverse effect of gentamicin. Nephrotoxicity can lead to kidney damage, and monitoring for this adverse reaction is crucial during gentamicin therapy.

Correct Answer: D

Rationale: A urine output of 200 mL in 8 hours indicates decreased kidney function, potentially due to Furosemide therapy. This finding can suggest inadequate renal perfusion and impaired drug clearance, necessitating immediate reporting to prevent further complications like electrolyte imbalances and worsening heart failure.

Correct Answer: A

Rationale: The client should avoid eating or drinking 15 min prior to and while chewing the nicotine gum.

Correct Answer: A

Rationale: The correct answer is to instruct the client to avoid salt substitutes. Lisinopril, an ACE inhibitor, can lead to hyperkalemia, so it's essential to avoid salt substitutes that may contain potassium which can further elevate potassium levels.

Correct Answer: A

Rationale: Prednisone can cause potassium depletion, so clients should increase their intake of potassium-rich foods such as bananas, oranges, and spinach. Potassium-rich foods help maintain electrolyte balance and prevent complications associated with low potassium levels, such as muscle weakness and irregular heartbeats.