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
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: 
Select and explain. 
A. Congenital cataract, B. Retinoblastoma, C. Endophtalmitis, D. Coats disease
B: Retinoblastoma
Answer: B: Retinoblastoma 
Explanation: 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.