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
[{'content': 'Aboifacient causing ototoxicity is : \nSelect and explain. \nA. Lead, B. Quinine, C. Mercury, D. Ergot', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Quinine', 'role': 'assistant'}]