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
What should be the loss of hearing at least for Weber's test to lateralise - 
Select and explain. 
A. 5 dB, B. 10 dB, C. 15 dB, D. 20 dB
A: 5 dB
Answer: A: 5 dB 
Explanation: None