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
Area of Cornea indented in Goldman Applanation  tonometer  for measuring IOP 
Select and explain. 
A. 3.66mm, B. 3.6mm, C. 3.0mm, D. 3.06mm
D: 3.06mm
Answer: D: 3.06mm 
Explanation: Area of Cornea indented in Goldman Applanation  tonometer  for measuring IOP is 3.06mm.