This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Anatomy
[{'content': 'The infectivity of a convalescent case of cholera lasts for \nSelect and explain. \nA. Less than 7 days, B. 7-14 days, C. 14-21 days, D. 21-28 days', 'role': 'user'}, {'content': "Answer: C \nExplanation: Preclinical or incubatory carrier -The incubatory carriers are potent carriers (1-5 days)Convalescent carrier - Patient who has recovered from an attack of cholera may continue to excrete vibrios, during his convalescence for 2 -3 weeksContact or healthy carrier - Subclinical infection contracted through association with a source of infection. Duration < 10 days.Chronic carrier - Over 10 years(Refer: K. Park's Textbook of Preventive and Social medicine, 24thedition, pg no: 244)", 'role': 'assistant'}]