A chemical substance produced by a microorganism for inhibiting the growth of others is known as:

Antibiotic

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Antibody

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Antigen

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Aflatoxin

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Solution

The correct option is A Antibiotic
Antibiotic is a chemical secreted by microorganisms (bacteria or fungi) that kills or hinders the growth of some kinds of bacteria.
For example:
Penicillins are a group of broadspectrum antibiotics originally obtained from Penicillium moulds.
Streptomycin is an antibiotic produced by gram-negative bacteria to treat several diseases.

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