This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Traumatic Lesions, Subject name: Ophthalmology
A 33 year old suffers from blunt trauma to the eye. Fundoscopy shows cherry red spot, the probable diagnosis is - 
Select and explain. 
A. Retinoblastoma, B. Commotio Retinae, C. Optic nerve transection, D. Posterior Vitreous Detachment
B: Commotio Retinae
Answer: B: Commotio Retinae 
Explanation: Ans. is 'b' i.e., Commotio Retinae o Berlin's oedema, also called commotio retinae, occurs in blunt trauma to eye. It manifests as milky white cloudiness involving a considerable area of the posterior pole with a 'cherry-red' spot in the foveal regiono The prognosis is excellent except in case of complications of choroidal rupture, hemorrhage or pigment epithelial damage, but damage to the macula will result in poorer recovery,o The outcome can be worsened in the case of retinal detachment, atrophy or hyperplasia. Visual field defects can occur. In late cases cystoid macular edema sometimes develops which can further lead to macular destructiono Commotio retinae is usually self limiting and there is no treatment as such. It usually resolves in 3-4 weeks.