This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Anatomy
Which of the following drug needs no dose modification in TB with CRF? 
Select and explain. 
A. Ethambutol, B. Rifampicin, C. INH, D. Pyrazinamide
B: Rifampicin
Answer: B: Rifampicin 
Explanation: In CRF we can give full dose of rifampicin because this drug is completely metabolize in liver