This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Non communicable diseases, Subject name: Social & Preventive Medicine
Lowest expulsion rate of IUD - 
Select and explain. 
A. Lippers loop, B. LNG, C. Progestase, D. CuT-220
C: Progestase
Answer: C: Progestase 
Explanation: Park's textbook of preventive and social medicine 23rd edition. *expulsion rate of lippes loop-12 to 20% *progestase-2.7%. *LNG- 6%.