A 2-year old child presented with leucocoria in the right eye since 2 months.On examination a total retinal detatchment was present in the same eye.Ultrasound B scan revealed a heterogenous subretinal mass with calcification.The most likely clinical diagnosis is

• A. Coats-disease
• B. Retinoblastoma
• C. Toxocariasis
• D. Retinal tuberculoma