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': 'Which of the following is a features of tympanic membrane perforation - \nSelect and explain. \nA. Tinnitus, B. Vertigo, C. Conductive deafness, D. Fullness in ear', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Tympanic membrane perforation is associated with a conductive hearing loss of 10-40 dB.', 'role': 'assistant'}]