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': 'All of the following are used as proxy measures for incubation period, except \nSelect and explain. \nA. Latent period, B. Generation time, C. Serial interval, D. Period of communicability', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]