This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable Diseases, Subject name: Social & Preventive Medicine
International certificate for travelling is required for - 
Select and explain. 
A. Pertusis, B. Yellow fever, C. Cholera, D. Plague
B: Yellow fever
Answer: B: Yellow fever 
Explanation: Ans. is 'b' ie Yellow Fever "India and most other countries require a valid certificate of vaccination against yellow fever from travellers coming from infected areas.It rests with each country to decide whether a certificate of vaccination against yellow fever shall be required for infants under one year of age. India requires vaccination of infants too.The validity of the certificate begins 10 days after the date of vaccination and extends up to 10 years." - Park, 17/e