This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy, Development and clinical examination, Subject name: Ophthalmology
[{'content': 'The depth of anterior chamber of the eye at the center is \nSelect and explain. \nA. 2.5mm, B. 3mm, C. 3.5mm, D. 4mm', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Anterior chamber It is bounded anteriorly by the back of cornea, and posteriorly by the anterior surface of iris and pa of ciliary body. The anterior chamber is about 2.5 mm deep in the centre in normal adults. It is slightly shallower in hypermetropes and deeper in myopes. It contains about 0.25 ml of aqueous humor. It communicates with posterior chamber through pupil. Reference : A.K.Khurana; 6th edition', 'role': 'assistant'}]