<prompt> Which antibiotic acts by inhibiting protein synthesis:CefotetanDoxycyclineCiprofloxacinOxacillin  <response>: Doxycycline is a tetracycline that act by inhibiting protein synthesis.Cefotetan and oxacillin are β-lactam antibiotics that act by inhibiting cell wall synthesis.Ciprofloxacin is a fluoroquinolone that acts by inhibiting DNA gyrase. 