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': 'Bilateral past-pointing is due to defect in \nSelect and explain. \nA. Brainstem, B. Cerebellum, C. Vestibular system, D. Basal ganglia', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Bilateral past pointing is due to defect in vestibular system Past pointing, falling and the slow component of nystagmus are all in the same direction. if there is acute vestibular failure say on the right side, nystagmus is to the left side but past pointing and falling towards right Ref: PL Dhingra 6th edition of Ear, Nose and Throat; Pg no 42', 'role': 'assistant'}]