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
Dunda's grant apparatus used in: 
Select and explain. 
A. Cold air caloric test, B. Fitzgerald Hallpike's test, C. Bithermal caloric test, D. Rinne test
A: Cold air caloric test
Answer: A: Cold air caloric test 
Explanation: Cold caloric test--employs Dundas Grant tube, which is a coiled tube wrapped in cloth. The air in the tube is cooled by pouring ethyl chloride and then blown into the ear.