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: Malignant tumor arising from the neurosensory cells of retina due to deletion of RB gene located on the long arm of chromosome 13(13q14). Ref: ak khurana 6th edition