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: Medicine
[{'content': 'Paraneoplastic opsoclonus myoclonus syndrome is most commonly associated with which malignancy in children? \nSelect and explain. \nA. Hepatoblastoma, B. Hepatocellular carcinoma, C. Lymphoma, D. Neuroblastoma', 'role': 'user'}, {'content': "Answer: D \nExplanation: 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. Opsoclonus-myoclonus may be cancer-related or idiopathic. When the cause is paraneoplastic, the tumors involved are usually cancer of the lung and breast in adults and neuroblastoma in children. Ref: Harrison's principle of internal medicine 17th edition, chapter 97.", 'role': 'assistant'}]