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
C: 9mm
Answer: C: 9mm 
Explanation: The lens continues to grow throughout life. At bih, it measures about 6.4 mm equatorially and 3.5 mm anteroposteriorly and weighs approximately 90 mg. The adult lens typically measures 9 mm equatorially and 5 mm anteroposteriorly and weighs approximately 255 mg. Ref. AAO Sec.11 (2011-2012) Pg.No. 7