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
[{'content': 'Surveillance is: March 2005 \nSelect and explain. \nA. Monitoring of activity of health workers, B. Continuous monitoring of occurrence and distribution of a disease, C. Monitoring of trends of a disease, D. Related to the virulence of the organism', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B: Continuous monitoring of occurrence and distribution of a disease', 'role': 'assistant'}]