This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diseases of orbit, Lids and lacrimal apparatus, Subject name: Ophthalmology
The Retinoblastoma stage 111 is treated by 
Select and explain. 
A. Enucleation, B. Exenteration, C. Radiotherapy, D. None
B: Exenteration
Answer: B: Exenteration 
Explanation: Stage 111 is extraocular extension.(that is tumor has spread to the orbit) and is thus treated by exenteration(all the orbital contents along with the periosteum of the bone is removed. Refer khurana 6/e