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
[{'content': 'Which of the following carriers received source of infection from other carriers is called - \nSelect and explain. \nA. Incubatory carrier, B. Convulescent carrier, C. Healthy carrier, D. Chronic carrier', 'role': 'user'}, {'content': 'Answer: A \nExplanation: <p> Incubatory carriers They are potential patients. Since then incubation period of cholera is sho(1-5 days) ,incubatory carriage is of sho duration. Park&;s textbook of preventive and social medicine,K.Park,23rd edition,page no:230 <\\p>', 'role': 'assistant'}]