This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ear, 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: D \nExplanation: Lateralisation of sound in Weber test with a tuning fork of 512Hz implies a conductive loss of 15-25 dB in the ipsilateral ear or an SNHL in the contralateral ear. Ref: Dhingra; 6th Edition; pg no 22', 'role': 'assistant'}]