This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy, Subject name: Ophthalmology
What is the depth of the anterior chamber? 
Select and explain. 
A. 2.5 to 3.5mm, B. 3.5mmto4.5mm, C. 4.5mm to 5.5mm, D. 5.5 mm to 6.5mm
A: 2.5 to 3.5mm
Answer: A: 2.5 to 3.5mm 
Explanation: Ans. is 'a' i.e., 2.5 to 3.5mm o 'The normal depth of anterior chamber of eye is 3.5mm to 2.5mm; less than 2.5mm depth can be risk for angle closure glaucoma.'