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Which one of the following is a narrow spectrum antibiotics ?

$(a)\;\text{tetracycline} \\ (b)\;\text{penicillin} \\(c)\;\text{streptomycin} \\ (d)\;\text{Chloramphemical} $
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Broad spectrum antibiotics are medicines effective against number of harmful micro-organisms
Penicillin has arrow spectrum.
Hence b is the correct answer.
answered Mar 10, 2014 by meena.p
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