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: ENT
[{'content': 'Lady has B/L hearing loss since 4 years which worsened during pregnancy. Type of impedence auditometry graph will be - \nSelect and explain. \nA. Ad, B. As, C. B, D. C', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]