This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cornea and sclera, Subject name: Ophthalmology
Thickest poion of sclera is - 
Select and explain. 
A. Anterior to rectus muscle inseion, B. Posterior to rectus musde inseion, C. Posterior pole, D. Limbus
C: Posterior pole
Answer: C: Posterior pole 
Explanation: Thickness of sclera varies considerably in differentindividuals and with the age of the person. It isgenerally thinner in children than the adults and infemales than the males. Sclera is thickest posteriorly(1mm) and gradually becomes thin when tracedanteriorly. It is thinnest at the inseion of extraocularmuscles (0.3 mm). REF:Comprehensive ophthalmology,20th edition,AK Khurana,pg no.127.