This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Intra Ocular Tumour, Subject name: Ophthalmology
Reese-Ellsworth classification is used for? 
Select and explain. 
A. Rhabdomyosarcoma, B. Retinoblastoma, C. Optic nerve sheath tumor, D. Meningioma
B: Retinoblastoma
Answer: B: Retinoblastoma 
Explanation: ANSWER: (B) RetinoblastomaREF: Decision Making in Radiation Oncology, Volume 2 by Jiade J. Lu page 1041Repeat from June 2008Reese-Ellsworth classification of Retinoblastoma:TypeDescriptionGroup I"Very favourable"ASolitary tumor, less than 4 dd in size, at or posterior to the equatorBMultiple tumors, none over 4 dd in size, all at or posterior to the equatorGroup II"Favourable"ASolitary tumor, 4-10 dd in size, at or posterior to the equatorBMultiple tumors, 4-10 dd in size, all posterior to the equatorGroup III"Doubtful"AAny lesion anterior to the equatorBSolitary tumors larger than 10 dd posterior to the equatorGroup IV"Unfavorable"AMultiple tumors, some larger than 10 ddBAny lesion extending to the ora serrataGroup V"Very unfavourable"AMassive tumors involving over half the retinaBVitreous seeding*dd= disc diameter (approximately 1.5 mm)