Which of the following best describes the rationale for culture and susceptibility testing before starting antibiotics?

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Rationale for culture and susceptibility testing before antibiotics is to identify the exact organism causing the infection and determine which drugs it is susceptible to. This lets you tailor therapy to use an antibiotic that will actually work, minimize exposure to unnecessary or ineffective drugs, and support antimicrobial stewardship by reducing the development of resistance. In practice, you may start empirical treatment to cover likely pathogens, but you adjust the regimen once culture and susceptibility results are available. Choosing the most expensive antibiotic, skipping testing to save time, or always using broad-spectrum agents regardless of culture can lead to higher costs, more side effects, and faster resistance.