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': '. Bacteria is not shed in - \nSelect and explain. \nA. Carrier state, B. Latent infection, C. Incubation period, D. Subclinical infection', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]