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': 'After rupture of tympanic membrane the hearing loss is - \nSelect and explain. \nA. 10-40 dB, B. 5-15 dB, C. 20 dB, D. 300 dB', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]