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': 'What is the length of an eye ball at bih \nSelect and explain. \nA. 24 mm, B. 22 mm, C. 17.5 mm, D. 10.5 mm', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Length of an eye ball at bih is between 16.5 - 17.5mm, whereas in an adult the length is between 23-23 mm.', 'role': 'assistant'}]