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': 'At what angle is the hallpike thermal caloric test done? \nSelect and explain. \nA. 15deg, B. 30deg, C. 45deg, D. 60deg', 'role': 'user'}, {'content': 'Answer: B \nExplanation: In the Hallpike test, the head is tilted 30deg forward so that horizontal canal is veical. (Ref: Diseases of EAR, NOSE, THROAT by PL DHINGRA; 6th Edition; Page no. 43)', 'role': 'assistant'}]