(D) Antibiotics are chemical substances produced by some microbes which can kill or retard the growth of other disease-causing microbes. Most of the c

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(D) Antibiotics are chemical substances produced by some microbes which can kill or retard the growth of other disease-causing microbes. Most of the commercially used antibiotics are obtained from fungi (e.g.,Penicillium) and actinomycetes (e.g.,Streptomyces). Therefore,both $(a)$ and $(b)$ are correct sources of antibiotics.