What is the definition of selective toxicity in relation to anti-infectives?

Rationale: A. This option is incorrect because complete elimination of all microorganisms is not typically achievable or desirable, as some microorganisms are beneficial. B. While this statement is partially correct, it does not fully encompass the definition of selective toxicity, which emphasizes the balance of efficacy and safety. C. Selective toxicity refers to the ability of an anti-infective to kill or inhibit the growth of microorganisms without causing harm to the host. This principle is fundamental in developing effective antimicrobial agents that target pathogens while minimizing toxicity to human cells. D. This option implies a focus on targeting specific microorganisms, which is related but not the complete definition of selective toxicity, as it also involves not harming the host.