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
Which of the following is primarily a bactericidal drug? 
Select and explain. 
A. Chloramphenicol, B. Gentamicin, C. Sulphadiazine, D. Tetracycline
B: Gentamicin
Answer: B: Gentamicin 
Explanation: Aminoglycosides: Streptomycin, Gentamicin, Amikacin, Neomycin, etc. are considered as bactericidal drugs.