This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Antibiotics, Subject name: Pharmacology
[{'content': 'The drug which has highest CSF penetration among anti TB drugs? \nSelect and explain. \nA. INH, B. Rifampicin, C. Ethambutol, D. Streptomycin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Among the anti TB drugs used, INH has highest CSF penetrationRef: Harrison 19th / Page 205', 'role': 'assistant'}]