This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Childhood malignancies, Subject name: Pediatrics
[{'content': 'Opsoclonus is associated with: \nSelect and explain. \nA. Neuroblastoma, B. Nephroblastoma, C. Retinoblastoma, D. Hypernephroma', 'role': 'user'}, {'content': "Answer: A \nExplanation: Opsoclonus-myoclonus-ataxia syndrome' associated with Neuroblastoma Rapid, uncontrollable jerking eye & body movements, poor coordination", 'role': 'assistant'}]