This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chicken Pox, Subject name: Social & Preventive Medicine
[{'content': 'All of the following are WHO notifiable diseases EXCEPT: \nSelect and explain. \nA. Cholera, B. Chicken pox, C. Plague, D. Yellow fever', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) Chicken poxRef : K. Park 23rd ed. /143, 841, 21sted. 1780* The following diseases are notifiable to WHO in Geneva:# Cholera# Plague# Yellow fever* In addition to these a few others like: Louse borne typhus, relapsing fever, Polio, Influenza, malaria, rabies and salmonellosis are subject to international surveillance.', 'role': 'assistant'}]