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': 'The time interval between diagnosis by early detection and diagnosis by other means is- \nSelect and explain. \nA. Incubation period, B. Lead time, C. Serial interval, D. Latent period', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Lead time", 'role': 'assistant'}]