This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Assessment of Vestibular Function, Subject name: ENT
[{'content': 'In Fitzgerald and Hallpike differential caloric test, cold water irrigation at 30deg centigrade in the left ear in a normal person will produce: \nSelect and explain. \nA. Nystagmus to the right side, B. Nystagmus to the left side, C. Direction changing nystagmus, D. Positional nystagmus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (a) Nystagmus to the right side(Ref. Scott Brown, 8th ed., Vol 2; page 796)If the same is done with warm water the nystagmus will be towards the same side, i.e. left side.Direction changing nystagmus is seen in central lesions.Positional nystagmus is seen in BPPV.', 'role': 'assistant'}]