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
Opsoclonus - Myoclonus is a phenomenon seen in 
Select and explain. 
A. Neuroblastoma, B. Wilms tumor, C. Meningioma, D. Coical tuberculoma
A: Neuroblastoma
Answer: A: 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.