This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Microbiology
A 3 year old male presents with a sudden onset of visual loss in the left eye. Ophthalmological examination reveals strabismus and white pupillary reflex. Fundus finding is shown below. What is your diagnosis? 
Select and explain. 
A. Retinoblastoma, B. Sickle cell retinopathy, C. Toxoplasmosis, D. Coats disease
D: Coats disease
Answer: D: Coats disease 
Explanation: The clinical history along with fundus finding of telangiectatic vessels and hard exudates points towards a diagnosis of Coats disease. Coats diseaseIdiopathic non-hereditary, retinal telangiectasia.Age group-1st decade of life (average 5 years).Clinical features-Unilateral visual loss, strabismus, leukokoria.It is characterized by retinal angiomas and massive subretinal exudation from the angiomas. This exudation produces retinal detachment. Cataract and angle closure glaucoma may also occur in late stages.