This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
[{'content': 'Which of the following is true of cholera- \nSelect and explain. \nA. Recent epidemic was due to classical type, B. Causes secretory diarrhoea, C. Caused by endotoxin, D. Vibriocidal antibodies correspond to susceptibility', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Vibrio causes secretory diarrhea.\n\nAbout Other options:\n\nRecent epidemics are due to O1 ElTor and also O139 serovar.\xa0(Classical still exists and few cases were reported from Bangladesh)\nVibriocidal antibodies in serum (titer 1:20) have been associated with protection against colonization and\xa0disease. …………… Jawetz 25/e p237\nEndotoxin (LPS) does not play any role in pathogenicity of cholera but is responsible for immunity developed by killed\xa0vaccine.', 'role': 'assistant'}]