This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology and breast, Subject name: Anatomy
[{'content': 'Opsoclonus - Myoclonus is a phenomenon seen in \nSelect and explain. \nA. Neuroblastoma, B. Wilms tumor, C. Meningioma, D. Coical tuberculoma', 'role': 'user'}, {'content': 'Answer: A \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.', 'role': 'assistant'}]