Final answer:
The nurse should teach the patient to take tetracycline 1 hour before or 2 hours after meals.
Step-by-step explanation:
The correct answer is D. 1 hour before or 2 hours after meals.
Tetracycline is an antibiotic medication that is used to treat various bacterial infections. It is important to take tetracycline on an empty stomach because food can interfere with its absorption and effectiveness. Taking it 1 hour before or 2 hours after meals allows the medication to be properly absorbed by the body.