This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
A contact carrier in cholera has the following characteristic - 
Select and explain. 
A. Gall bladder is infected, B. Stools are not positive for cholera vibrio, C. Does not play any role in spread of infection, D. Duration of carrier state is less than 10 days
D: Duration of carrier state is less than 10 days
Answer: D: Duration of carrier state is less than 10 days 
Explanation: <p> The duration of contact carrier state is usually less than 10 days. The gall bladder is not infected. It plays an impoant role in the spread of cholera. The stool culture is frequently positive for V. cholera O1. Park&;s textbook of preventive and social medicine,K.Park,23rd edition,page no:230. <\p>