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: Ophthalmology
[{'content': 'A child age 5 years, presents with loss of vision and mild proptosis of left eye . On examination direct is absent but consensual is present in left eye. He is having: \nSelect and explain. \nA. Optic nerve glioma, B. Optic sheath meningioma, C. Retinoblastoma, D. Optic disc angioma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Optic nerve glioma', 'role': 'assistant'}]