The incorrect statement about chloramphenicol is : Option C : it is a bactericidal drug. Chloramphenicol is not typically classified as a bactericidal drug; rather, it is known to be a bacteriostatic antibiotic, which means it inhibits the growth and multiplication of bacteria rather than killing them directly. Here's a brief explanation of the properties of chloramphenicol : Bacteriostatic Drug : Chloramphenicol works by inhibiting bacterial protein synthesis, thus preventing bacterial growth. Broad Spectrum Antibiotic : It is effective against a wide range of bacteria, including both Grampositive and Gram-negative species. Used to Treat Typhoid : Chloramphenicol is utilized in treating serious infections like typhoid fever caused by Salmonella typhi. The bactericidal property does not fit chloramphenicol as it is primarily known to arrest bacterial progression rather than causing bacterial cell death.