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: Unknown
[{'content': 'The immunity responsible for to control epidemic spread of a pathogen \nSelect and explain. \nA. Innate immunity, B. Active acquired immunity, C. Herd immunity, D. Passive natural immunity', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Herd immunity-\nOverall immunity of a community to a pathogen\nIf Herd immunity is good- chance of epidemic is less\nEradication of a communicable disease- depends on good Herd immunity\nProvided by mass vaccination by live vaccination to all individual at same time.', 'role': 'assistant'}]