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
All of the following drugs are bactericiadal except 
Select and explain. 
A. Isoniazid, B. Tigecycline, C. Daptomycin, D. Ciprofloxacin
B: Tigecycline
Answer: B: Tigecycline 
Explanation: Tigecycline is a newer drug in the class Glycylcyclines It's mechanism of action and most propeies are similar to tetracycline. However it is resistant to reflux pump Most protein synthesis inhibiting drugs are bacteriostatic except aminoglycosides Isoniazid ,Ciprofloxacin, and daptomycin are bactericidal Ref KK Sharma 2/e p 733