This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Ophthalmology
[{'content': 'The length of the eye ball is \nSelect and explain. \nA. 12 mm, B. 16 mm, C. 20 mm, D. 24 mm', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D. i.e. 24 mm Antero posterior diameter of eye is 17.5 mm at bih and reaches 24 mm in adultQ Eye Diameter Power Pressure Refractory index Veical 23 mm Lens +16DQ Goldmann 10.4 - 20. Air 1 Horizontal 23.5 Cornea +44 DQ applantation 4 mmHg Aqueous 1.336 mm Total +60 DQ Schiotz 10.5- 21.7 Humor Anteroposte- 24 New born eye +2.5 Indentation mmHg Vitrous 1.336 nor (adult) mmQ is DQ Humor A-P (bih) 17.5 hypermetropic Cornea 1.376 mm Crystaline 1.386? Circumference 75mm Lens 1.406Q Volume 6.5 ml (coex? core nucleus) Weight 7 gm', 'role': 'assistant'}]