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
[{'content': 'International ceificate for travelling is required for - \nSelect and explain. \nA. Peussis, B. Yellow fever, C. Cholera, D. Plague', 'role': 'user'}, {'content': "Answer: B \nExplanation: - measures designed to restrict the spread of yellow fever are specified in the International Health Regulations of WHO. - all travelling exposed to risk of yellow fever or passing through endemic zones of yellow fever must posses a valid international ceificate against yellow fever before they are allowed to enter yellow fever receptive areas. Reference : Park's textbook of preventive and social medicine, 23rd edition pg no:283 <\\p>", 'role': 'assistant'}]