Pharmacology A person on anti-tubercular drugs complained of deafness and tinnitus in one ear. Which of the following is the causative agent? A Streptomycin B Isoniazid C Ethambutol D Rifampicin 💡 Explanation A person on anti-tubercular drugs complained of deafness and tinnitus in one ear. Which of the following is the causative agent? ✓ Correct Answer: A. Streptomycin