This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Aminoglycosides, Subject name: Pharmacology
Irreversible hearing loss caused by - 
Select and explain. 
A. Gentamycin, B. Clarithromycin, C. Both of the above, D. None of the above
A: Gentamycin
Answer: A: Gentamycin 
Explanation: Ans. is 'a' i.e., Gentamycin o Gentamycin is the most commonly used of the aminoglycosides. It produces vestibular toxicity and irreversiblehearing loss.o Clarithromycin is known to produce reversible hearing loss.