This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ocular motility and squint, Subject name: Ophthalmology
Miners nystagmus is of which type 
Select and explain. 
A. Rotatory, B. Lateral, C. Veical, D. All of the above
A: Rotatory
Answer: A: Rotatory 
Explanation: Miner's nystagmus: It is a rapid rotatory type of nystagmus which occurs in coal mine workers. It probably results from fixation difficulties in the dim illumination. Ref:- A K KHURANA; pg num:-337