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
[{'content': 'Equatorial diameter of the lens is - \nSelect and explain. \nA. 7 mm, B. 8 mm, C. 9 mm, D. 10 mm', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 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', 'role': 'assistant'}]