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
Expulsion rate following intrauterine device inseion is: 
Select and explain. 
A. 1%, B. 5%, C. 20%, D. 30%
C: 20%
Answer: C: 20% 
Explanation: Expulsion rates vary between 12 to 20%. Expulsion rates depend on clinical skill, timing of inseion and age and parity of the user. Ref: Park, 22nd edition pg: 459