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': 'Vossious ring occurs in: \nSelect and explain. \nA. Penetrating injury, B. Concussion injury, C. Lens dislocation, D. Extracapsular extraction', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Concussion injury', 'role': 'assistant'}]