A nurse is reinforcing discharge teaching with a client who has a new diagnosis of tuberculosis. Which of the following instructions should the nurse include in the teaching?

A. "You should stop taking your antituberculin medication after 2 weeks.": Antitubercular medications must be taken for the full prescribed course, often 6–9 months, to ensure eradication of Mycobacterium tuberculosis and prevent drug resistance. Stopping early can lead to treatment failure and multidrug-resistant TB. B. "You should have a sputum examination every 4 weeks.": Regular sputum testing allows monitoring of treatment effectiveness and confirms when the client is no longer infectious. Monthly sputum cultures are standard practice during TB therapy to guide clinical management. C. "You should obtain a chest x-ray every 3 months.": Chest x-rays may be repeated to assess healing in complicated cases, but they are not required routinely every 3 months for all clients during treatment. Sputum testing is more reliable for evaluating infectious status. D. "You should schedule a tuberculin skin test every 6 months.": Tuberculin skin tests are used for initial diagnosis or exposure screening, not for monitoring treatment response in clients with active TB. Repeating the test during therapy does not provide useful clinical information.