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
Spontaneous veical nystagmus is seen in the lesion of 
Select and explain. 
A. Mid brain lesion, B. Labyrinth, C. Vestibule, D. Cochlea
A: Mid brain lesion
Answer: A: Mid brain lesion 
Explanation: 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.