This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
A patient develops an infection of methicillin-resistant Staphylococcus aureus. All of the following can be used to treat this infection except : 
Select and explain. 
A. Cotrimoxazole, B. Cefaclor, C. Ciprofloxacin, D. Vancomycin
B: Cefaclor
Answer: B: Cefaclor 
Explanation: None