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
Ceificate of vaccination of Yellow Fever is valid for how many years: September 2010 
Select and explain. 
A. 1 year, B. 2 years, C. 5 years, D. 10 years
D: 10 years
Answer: D: 10 years 
Explanation: Ans. D: 10 years