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': 'Weakest poion of sclera is \nSelect and explain. \nA. Limbus, B. Quator, C. Anterior to attachment of superior rectus, D. Behind rectus inseion', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. Behind rectus inseion The sclera is thickest (1mm) at the posterior pole near the optic nerveQ and thinnest (0.3mm) just behind the inseion of rectus muscleQ.', 'role': 'assistant'}]