Which of the following antibiotic is insensitive to penicillinase?

Which of the following antibiotic is insensitive to penicillinase? Correct Answer Cephalothin

Cephalothin is a semi-synthetic derivate of cephalosporin C (active against Gram-negative bacteria), having action similar to that of benzylpenincillin but unlike cephalosporin C, insensitive to penicillinase.
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