Correct Answer: B

Rationale: The correct answer is B: Alcohol. Clients should avoid alcohol while taking metronidazole to prevent a disulfiram-like reaction, which can cause symptoms such as nausea, vomiting, headache, and flushing. It is important to educate clients on the potential interactions between metronidazole and alcohol to ensure the effectiveness of the medication and prevent adverse reactions.

Correct Answer: B

Rationale: When administering enoxaparin via a prefilled syringe for deep subcutaneous injection, the nurse should insert the needle completely into the client's tissue. This ensures proper delivery of the medication and adherence to the correct administration technique, promoting optimal therapeutic effects and reducing the risk of complications.

Correct Answer: D

Rationale: The correct instruction is to apply the Nitroglycerin transdermal patch to a hairless area of skin. This ensures proper absorption of the medication. It is important to rotate the application site daily to prevent skin irritation and tolerance development. Applying the patch to the same site each day can lead to decreased efficacy and potential skin reactions. Removing the patch at night is not necessary as the patches are usually worn continuously to provide constant medication delivery. Covering the patch with a heating pad can increase the absorption of the medication and lead to an overdose, which is not recommended.

Correct Answer: B

Rationale: The correct answer is to monitor the client's potassium levels. Hypokalemia can increase the risk of Digoxin toxicity. Potassium levels should be closely monitored to prevent adverse effects.

Correct Answer: C

Rationale: The correct instruction for a client starting clonidine therapy for hypertension is to avoid driving until their reaction to the medication is known. Clonidine can cause drowsiness, so engaging in activities like driving that require alertness should be avoided until the individual understands how the medication affects them.