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
Ethacrynic acid is not used due to ? 
Select and explain. 
A. Renal toxicity, B. Ototoxicity, C. GI toxicity, D. Pulmonary toxicity
B: Ototoxicity
Answer: B: Ototoxicity 
Explanation: Ans. is 'b' i.e., Ototoxicity Ethacrynic acid is most ototoxic loop diuretic.