This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti Microbial, Subject name: Pharmacology
Bacteriostatic anti - TB drug is 
Select and explain. 
A. Pyrazinamide, B. INH, C. Rifampin, D. Ethambutol
D: Ethambutol
Answer: D: Ethambutol 
Explanation: Ans. is 'd' i.e., Ethambutol All first line drugs are tuberculocidal except ethambutol which is tuberculostatic:* Tuberculocidal: Rifampin, INH, streptomycin, pyrazinamide.* Tuberculostatic : Ethambutol, PAS, cycloserine, thioacetazone.