This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Introduction, Subject name: Pediatrics
Seroconversion rate is how much after 3 doses of Hepatitis B vaccine? 
Select and explain. 
A. 30%, B. 50%, C. 70%, D. 95%
D: 95%
Answer: D: 95% 
Explanation: -Seroconversion rates exceed 95% after 3 doses of Hepatitis B vaccine. - Antibody titre > 10mIU/ml is protective - This Vaccine usually induces long-term immunity- so, booster doses are not routinely recommended - Double dose of vaccine/ boosters - recommended in pts with chronic kidney disease / immunodeficiency - in whom titers may wane