The following antibiotic is Bacteriostatic.

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Erythromycin

Amoxycillin

Boric acid

Tincture of Iodine

answer is A.

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Detailed Solution

Erythromycin is a type of antibiotic that is bacteriostatic, which means that it inhibits the growth and reproduction of bacteria rather than killing them.
It does this by binding to the ribosomes of the bacteria, which are responsible for the production of proteins necessary for the bacteria's survival and growth.
By binding to these ribosomes, erythromycin prevents the bacteria from producing new proteins, ultimately leading to their inhibition.
Amoxicillin (b) is a bactericidal antibiotic, which means that it kills bacteria by interfering with the bacterial cell wall synthesis.
Boric acid (c) is an antiseptic and antifungal agent that is used to treat and prevent infections.
It works by disrupting the cell membrane of the microorganisms, ultimately leading to their death.
Tincture of iodine (d) is also an antiseptic agent that is used to disinfect the skin and prevent infections.
It works by releasing free iodine, which is toxic to microorganisms and can kill them.

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