This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
[{'content': 'Watery diarrhea in children is caused by \nSelect and explain. \nA. ETEC, B. EPEC, C. EIEC, D. EAEC', 'role': 'user'}, {'content': "Answer: B \nExplanation: Enteropathogenic E.coli: associated mainly with diarrhea in children and infants usually occurring as an institutional outbreak. The pathogenesis of EPEC diarrhea is not fully understood. EPEC is non-invasive and does not produce enterotoxin. Another mechanism is by adherence to the enterocyte membrane. This activity is regulated by the chromosomally coded locus of enterocyte effacement (LEE). This is a pathogenicity island by an intimin protein coded for by the eae gene. This results in the disruption of the brush border microvilli. Reference: Textbook of Microbiology; Anathanarayan and paniker's; 10th edition; Page no: 285", 'role': 'assistant'}]