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': "'Safe zone' of the eye ball is: \nSelect and explain. \nA. At the limbus, B. 3-4 mm behind the limbus, C. 8-9 mm behind the limbus, D. 12 mm behind the limbus", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. 8-9 mm behind the limbus', 'role': 'assistant'}]