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
Caloric test has: 
Select and explain. 
A. Slow component only, B. Fast component only, C. Slow + fast component, D. Fast component occasionally
C: Slow + fast component
Answer: C: Slow + fast component 
Explanation: 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).