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
In a normal adult person the depth of anterior chamber in the centre is about: 
Select and explain. 
A. 2.5 mm, B. 3 mm, C. 3.5 mm, D. 4 mm
A: 2.5 mm
Answer: A: 2.5 mm 
Explanation: Ans. 2.5 mm