This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Contraceptives, Subject name: Gynaecology & Obstetrics
In CuT 200, '200' stands for: 
Select and explain. 
A. Effective for 200 weeks, B. Surface area of copper in sq.mm, C. Weight in milligrams, D. Amount of copper released in mcg per day
B: Surface area of copper in sq.mm
Answer: B: Surface area of copper in sq.mm 
Explanation: In CuT 200, the '200' expression means that the copper poion has an exposed surface area of 200 sq.mm.