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': 'Ataxia, nystagmus and ophthalmoplegia is seen in- \nSelect and explain. \nA. Mysthenia gravis, B. Chronic progressive external ophthalmoplegia, C. 3rd nerve palsy, D. None', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Chronic progressive externalophthalmoplegia (CPEO), is a type of eye disorder characterized by slowly progressive inability to move the eyes and eyebrows. It is often the only feature of mitochondrial disease, in which case the term CPEO may be given as the diagnosis. It is characterized by Nystagmus Ataxia Ophthalmoplegia Ref khurana 6/e', 'role': 'assistant'}]