This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Retina, Subject name: Ophthalmology
Most common primary intraocular tumor in children 
Select and explain. 
A. Retinoblastoma, B. Malignant melanoma of choroid, C. Malignant melanoma of ciliary body, D. Rhabdomyosarcoma
A: Retinoblastoma
Answer: A: Retinoblastoma 
Explanation: Ans. (a) RetinoblastomaRef: Kanski 7/e, p. 510Retinoblastoma - most common intraocular tumor in children.Rhabdomyosarcoma - most common orbital malignant tumor in children.