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
The following drugs can produce ototoxicity except : 
Select and explain. 
A. Ethacrynic acid, B. Aztreonam, C. Gentamicin, D. Frusemide
B: Aztreonam
Answer: B: Aztreonam 
Explanation: None