This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
[{'content': 'The time interval between diagnosis by early detection and diagnosis by other means(2004) \nSelect and explain. \nA. Incubation period, B. Lead time, C. Serial interval, D. Latent period', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans: bRef: Park, 17th ed, p. 109 & 18th ed, p. 113, 114', 'role': 'assistant'}]