Question

multiple choice question
what is an antibiotic?
any agent used in the treatment, relief, or prophylaxis of a disease
synthetic agents used against all types of microbial infections
agents only used against cancerous lesions
natural agents used only against bacterial infections

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Explanation:

Antibiotics are substances (natural or synthetic) that specifically target bacterial infections. The first option is too broad (covers any disease agent), the second is for all microbial infections (antibiotics target bacteria, not all microbes like viruses), the third is for cancer (antibiotics don't target cancer). So the correct option is the one about natural agents against bacterial infections.

Answer:

Natural agents used only against bacterial infections