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
Bacteriostatic antitubercular drug among the following is : 
Select and explain. 
A. Isoniazid, B. Rifampicin, C. Streptomycin, D. Ethambutol
D: Ethambutol
Answer: D: Ethambutol 
Explanation: None