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': 'Area of Cornea indented in Goldman Applanation  tonometer  for measuring IOP \nSelect and explain. \nA. 3.66mm, B. 3.6mm, C. 3.0mm, D. 3.06mm', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Area of Cornea indented in Goldman Applanation\xa0 tonometer\xa0 for measuring IOP is 3.06mm.', 'role': 'assistant'}]