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': "'Endemic Disease' means that a disease: \nSelect and explain. \nA. Occurs clearly in excess of normal expectancy, B. Is constantly present in a given population group, C. Exhibits seasonal pattern, D. Is prevalent among animals", 'role': 'user'}, {'content': "Answer: B \nExplanation: Endemic refers to the constant presence of a disease or infectious agent within a given geographic area or population group without impoation from outside. Ref: Park's Textbook Of Preventive And Social Medicine By K. Park, 19th Edition, Page 88; Park's Textbook Of Preventive And Social Medicine By K. Park, 18th Edition, Page 86", 'role': 'assistant'}]