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': 'Commonest type of concussion cataract is: \nSelect and explain. \nA. Punctate cataract, B. Early rosette-shaped cataract, C. Late rosette-shaped cataract, D. Zonular cataract', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Punctate cataract', 'role': 'assistant'}]