Choice A rationale:

Using multiple drugs to treat TB is not primarily done to reduce the cost of treatment. While cost considerations are essential in healthcare, the main reason for employing multiple drugs is to prevent drug resistance and improve treatment outcomes.

Choice B rationale:

The rationale for using multiple drugs to treat TB is to minimize the risk of drug resistance. TB is caused by Mycobacterium tuberculosis, and the bacteria can develop resistance to single-drug treatments quite rapidly. Using a combination of drugs with different mechanisms of action makes it harder for the bacteria to become resistant to all drugs simultaneously, ensuring a more effective treatment.

Choice C rationale:

While using multiple drugs may help achieve a quicker cure, the primary reason for combining drugs in TB treatment is to prevent drug resistance. Faster cure is a secondary benefit, but the prevention of drug-resistant strains is of paramount importance in TB management.

Choice D rationale:

Avoiding potential drug interactions is an essential consideration in any medical treatment, but it is not the primary reason for using multiple drugs in TB treatment. The main focus is on preventing drug resistance and increasing treatment success.