This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ocular Embryology& Anatomy, Subject name: Ophthalmology
Axial length of eye ball is: 
Select and explain. 
A. 16 mm, B. 20 mm, C. 24 mm, D. 28 mm
C: 24 mm
Answer: C: 24 mm 
Explanation: Dimension of eye ball Anteroposterior- 24mm Circumference- 75mm Volume of each eye- 6 ml Volume of each orbit = 30 ml Weight- 7gm