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
Paraneoplastic opsoclonus myoclonus syndrome is most commonly associated with which malignancy in children? 
Select and explain. 
A. Hepatoblastoma, B. Hepatocellular carcinoma, C. Lymphoma, D. Neuroblastoma
D: Neuroblastoma
Answer: D: Neuroblastoma 
Explanation: 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.