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
Net power of Cornea 
Select and explain. 
A. +48D, B. +43D, C. +45D, D. +60D
B: +43D
Answer: B: +43D 
Explanation: Power of anterior surface of Cornea = +48D
Power of posterior surface of Cornea= –5D
Net power of Cornea= +48D –5D = +43D