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: Gynaecology & Obstetrics
Aboifacient causing ototoxicity is : 
Select and explain. 
A. Lead, B. Quinine, C. Mercury, D. Ergot
B: Quinine
Answer: B: Quinine 
Explanation: Quinine