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
What is the duration of validity of yellow fever vaccination? 
Select and explain. 
A. 2 years, B. 5 years, C. 10 years, D. 12 years
C: 10 years
Answer: C: 10 years 
Explanation: The validity of ceificate of vaccination for yellow fever begins 10 days after vaccinatuion and is valid upto 10 years. Ref: Park 21st edition, page 259.