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
Drug causing deafness is : 
Select and explain. 
A. Thiazide, B. Spiranolactone, C. Ethacrynic acid, D. Triamterene
C: Ethacrynic acid
Answer: C: Ethacrynic acid 
Explanation: None