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': 'Viral enterotoxin is detected as a possible mechanism of pathogenesis in : \nSelect and explain. \nA. Adeno virus, B. Rota virus, C. Calcivirus, D. Astrovirus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Mechanism of Rotavirus diarrhea :\na. Rotavirus destroy mature enterocytes of proximal small intestine.\n\nLoss of absorptive villi and proliferation of secretory crypt cells\n\n– Secretory diarrhea\n\nBrush border enzymes are reduced so unmetabolized disaccharides accumulates resulting.\n\n– Osmotic diarrhea\nb. NSP4 = enterotoxin which alteres epithelial cell function and permeability causing secretory diarrhea.\nc. Virus evoke fluid secretion by the activation of enteric nervous system in intestinal wall.', 'role': 'assistant'}]