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
Most common primary intraocular neoplasm in a child is - 
Select and explain. 
A. Metastasis, B. Retinoblastoma, C. Basal cell carcinoma, D. Squamous cell carcinoma
B: Retinoblastoma
Answer: B: Retinoblastoma 
Explanation: Ans. is 'b' i.e., Retinoblastoma