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
[{'content': 'The mother of a one and a half year old child gives history of a white reflex from one eye for the past 1 month. On computed tomography scan of the orbit there is calcification seen within the globe. The most likely diagnosis is: \nSelect and explain. \nA. Congenital cataract, B. Retinoblastoma, C. Endophtalmitis, D. Coats disease', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. (b) RetinoblastomaRef: Parson's 22/e, p. 400, Kanski 7/e, p. 514Presence of leukocoria (white pupillary reflex) and calcification within the globe in a one and a half year old child is almost diagnostic of retinoblastoma.", 'role': 'assistant'}]