This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lens, Subject name: Ophthalmology
Equatorial diameter of the lens is- 
Select and explain. 
A. 7mm, B. 8mm, C. 9mm, D. 10mm
D: 10mm
Answer: D: 10mm 
Explanation: Equatorial diameter of lens is 10mm. Ref: Foster 2nd/e p.1912.