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
[{'content': 'Caloric test has: \nSelect and explain. \nA. Slow component only, B. Fast component only, C. Slow + fast component, D. Fast component occasionally', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Caloric test is used to test vestibular function/labyrinthine function, So nystagmus induced by it is vestibular in origin. Vestibular nystagmus has both fast (of cerebral origin) and a slow component (of vestibular origin).', 'role': 'assistant'}]