This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Epidemiology, Subject name: Social & Preventive Medicine
[{'content': 'Which of the following does not show an incubatory carrier state? \nSelect and explain. \nA. Polio, B. Diphtheria, C. Measles, D. Cholera', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Incubatory carriers Can transmit the agent during the incubation period before clinical illness begins. Eg:Measles, Mumps, Polio, Peussis, Influenza, Diphtheria and Hepatitis B =In cholera, convalescent carriers are seen.', 'role': 'assistant'}]