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
[{'content': 'Miners nystagmus is of which type \nSelect and explain. \nA. Rotatory, B. Lateral, C. Veical, D. All of the above', 'role': 'user'}, {'content': "Answer: A \nExplanation: 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", 'role': 'assistant'}]