This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Tumors, Subject name: Ophthalmology
[{'content': 'In retinoblastoma, after enucleation, which tissue is sectioned to find out systemic metastasis- \nSelect and explain. \nA. Central retinal aery, B. Sclera and episclera, C. Optic nerve, D. Voex vein', 'role': 'user'}, {'content': 'Answer: C \nExplanation: *After enucleation, optic nerve is examined and if it shows tumor invasion, postoperative radiotherapy to the orbital apex and chemotherapy are given. Ref: Khurana 7th/e p.317.', 'role': 'assistant'}]