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
The most common primary cause of intraocular tumor in children- 
Select and explain. 
A. Retinoblastoma, B. Rhabdomyosarcoma, C. Neuroblastoma, D. Melanoma
A: Retinoblastoma
Answer: A: Retinoblastoma 
Explanation: *Most common intraocular tumor of childhood is retinoblastoma. Ref:Khurana 7th/e p.314,