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': 'Spontaneous veical nystagmus is seen in the lesion of \nSelect and explain. \nA. Mid brain lesion, B. Labyrinth, C. Vestibule, D. Cochlea', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Veical downbeat nystagmus indicates lesion at craniocervical region such as Arnold-Chiari malformation or degenerative lesion of the cerebellum. Veical upbeat nystagmus is seen in lesions at the junction of pons and medulla or pons and midbrain. Ref: Dhingra 7e pg 43.', 'role': 'assistant'}]