This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Ophthalmology
[{'content': 'Commotio retinae is seen in: \nSelect and explain. \nA. Concussion injury, B. Retinopathy of AIDS, C. Central vein thrombosis, D. Central aery thrombosis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Concussion injury', 'role': 'assistant'}]