This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy, Development and clinical examination, Subject name: Ophthalmology
[{'content': 'The sclera is thinnest at \nSelect and explain. \nA. Limbus, B. Equator, C. Optic nerve, D. Posterior to attachment of superior rectus', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The sclera is thickest near the optic nerve, where it is approximately 1 mm in thickness The sclera is thinnest (0.3 mm) posterior to the rectus muscle inseions and thickest (1.0 mm) at the posterior pole near the optic nerve head. Thinnest at the inseion of extraocular muscles (0.3 mm) Reference: khurana 6th edition pg 788', 'role': 'assistant'}]