This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ocular trauma , Subject name: Ophthalmology
Commotio retinae affects which pa of retina- 
Select and explain. 
A. Posterior pole, B. Peripheral retina, C. Inferior-nasal pa, D. Superior-nasal pa
A: Posterior pole
Answer: A: Posterior pole 
Explanation: *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 region. *It May disappear after some days or may be followed by pigmentary changes. Ref: Khurana 7th/e p.448