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
Cu T 200 is so called - 
Select and explain. 
A. 200 sqmm of Cu2+ over loop, B. 200 mm of Cu over loop, C. For 200 days, Cu concentration does not changes, D. 200 sqcm of Cu over loop
A: 200 sqmm of Cu2+ over loop
Answer: A: 200 sqmm of Cu2+ over loop 
Explanation: Ans. is 'a' i.e., 200 sq. mm of Cu+ over loop o The numbers included in the names of the intrauterine devices refer to the surface area (in sq. mm) of cooper on the device.