Which of the following is a narrow spectrum antibiotic?

Amoxycillin Chloramphenicol Vancomycin Dysidazirine

Dysidazirine

Dysidazirine is effective in treatment of only certain strains of tumour cells, hence they are narrow spectrum. Chloramphenicol, vancomycin and amoxycillin are examples of broad-spectrum antibiotics, that are used for treating different types of problems.