This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Demography and family planning, Subject name: Social & Preventive Medicine
In Cu T-200, the number denotes 
Select and explain. 
A. Surface area, B. Weight in microgram, C. Weight in miligram, D. Effective half life in week
A: Surface area
Answer: A: Surface area 
Explanation: In Cu T 200, the number included in the name of the device refer to the surface area in sq.mm of the copper on the device Reference : Park&;s textbook of preventive and social medicine,23rd edition, Page no: 496