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
[{'content': 'Most common primary intraocular neoplasm in a child is - \nSelect and explain. \nA. Metastasis, B. Retinoblastoma, C. Basal cell carcinoma, D. Squamous cell carcinoma', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Retinoblastoma", 'role': 'assistant'}]