This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
[{'content': 'Opsomyoclonus is encountered as C/F of ? \nSelect and explain. \nA. Meningioma, B. Neuroblastoma, C. Neurofibromatosis, D. Excision', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e. Neuroblastoma Opsoclonus-Myoclonus Syndrome Opsoclonus is a disorder of eye movement characterized by involuntary, chaotic saccades that occur in all directions of gaze; it is frequently associated with myoclonus and ataxia. Causes of Opsoclonus-myoclonus a) Idiopathic b) Cancer-related (paraneoplastic) - cancers associated with opsoclonus-myoclonus are usually lung and breast cancers in adults and neuroblastoma in children.", 'role': 'assistant'}]