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': 'SRK formula is used to calculate \nSelect and explain. \nA. Power of intraocular lens, B. Corneal curvature, C. Corneal endothelial cell count, D. Extent of retinal detachment', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Answer- A. Power of intraocular lensIntraocular lens power calculation :- Which requires Keratometry (K), Axial length of eyeball or Biometry (L) and aconstant (A). It is calculated by SRK formula:Power of IOL= A- 2.5L -0.9K', 'role': 'assistant'}]