This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chemotherapy, Subject name: Pharmacology
[{'content': 'Which antibiotic acts by inhibiting protein synthesis \nSelect and explain. \nA. Cefotetan, B. Doxycycline, C. Ciprofloxacin, D. Oxacillin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ref Goodman Gilman 11/e p 1173 Doxycycline is a tetracycline that act by inhibiting protein synthesis Cefotetan and oxacillin are beta lactam antibiotics that act by inhibiting cell wall synthesis Ciprofloxacin is a Fluroquinolone that acts by inhibiting DNA gyrase', 'role': 'assistant'}]