This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, 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. Endophthalmitis, D. Coats disease', 'role': 'user'}, {'content': 'Answer: B \nExplanation: While pupillary reflex (leukocoria) with calcification in tumor mass is characteristic of retinoblastoma.', 'role': 'assistant'}]