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: Ans. is \'b\' i.e., Causes secretory diarrhoea . Recent epidemic was due to non-01 V.cholerae (NAG vibrio) in 1992. This strain was designated serovar 0-139 (0-139 Bengal). . Enterotoxin (Cholera toxin) causes watery diarrhea by acting directly on secretory mechanism through cAMP. . Cholera is due to exotoxin (cholera toxin). Cholera vibrios also possess lipopolysaccharide (endotoxin), but it has no role in pathogenesis. . "Vibriocidal antibodies in serum have been associated with protection against colonization and disease"', 'role': 'assistant'}]