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: Medicine
The following drug is not useful for MRSA? 
Select and explain. 
A. Cefaclor, B. Cotrimoxazole, C. Ciprofloxacin, D. Vancomycin
A: Cefaclor
Answer: A: Cefaclor 
Explanation: None