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': 'Voex Vein invasion is commonly seen in: \nSelect and explain. \nA. Retinoblastoma, B. Malignant melanoma, C. Optic nerve gliomas, D. Medullo-epitheliomas', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Malignant melanoma Malignant melanoma of choroid is the commonest intraocular malignant primary tumor in adults Q. It involves voex veins Q as choroidal tissue is drained by these veins.', 'role': 'assistant'}]