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
Which of the following does not show an incubatory carrier state? 
Select and explain. 
A. Polio, B. Diphtheria, C. Measles, D. Cholera
D: Cholera
Answer: D: Cholera 
Explanation: 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.