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. 7 mm, B. 8 mm, C. 9 mm, D. 10 mm
C: 9 mm
Answer: C: 9 mm 
Explanation: Circumferance of the lens is known as equator. its diameter varies from 8.8mm-9.2mm and the anteroposterior diameter varies with accommodation. REF IMG