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
Most commonly used tuning fork in ear examination is 
Select and explain. 
A. 128 Hz, B. 256 Hz, C. 512 Hz, D. 1024 Hz
C: 512 Hz
Answer: C: 512 Hz 
Explanation: 512Hz is used normally Note: These tests are performed with tuning forks of different frequencies such as 128, 256, 512, 1024, 2048 and 4096 Hz, But for routine clinical practice, tuning fork of 512 Hz is ideal. Forks of lower frequencies produce a sense of bone vibration while those of higher frequencies have a shoer decay time and are thus not routinely preferred. Ref: Dhingra; 6th Edition; pg no 21