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: Social & Preventive Medicine
In the term 'CuT 200', the number denotes which of the following parameters? 
Select and explain. 
A. Weight in Microgram, B. Weight in Milligram, C. Surface area, D. Length of Thread/Tail
C: Surface area
Answer: C: Surface area 
Explanation: CuT 200 is otherwise known as Copper T. It refers to the surface area (in sq.mm) of the copper on the device.