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': "What should be the loss of hearing at least for Weber's test to lateralise - \nSelect and explain. \nA. 5 dB, B. 10 dB, C. 15 dB, D. 20 dB", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]