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
Viral enterotoxin is detected as a possible mechanism of pathogenesis in : 
Select and explain. 
A. Adeno virus, B. Rota virus, C. Calcivirus, D. Astrovirus
B: Rota virus
Answer: B: Rota virus 
Explanation: Mechanism of Rotavirus diarrhea :
a. Rotavirus destroy mature enterocytes of proximal small intestine.

Loss of absorptive villi and proliferation of secretory crypt cells

– Secretory diarrhea

Brush border enzymes are reduced so unmetabolized disaccharides accumulates resulting.

– Osmotic diarrhea
b. NSP4 = enterotoxin which alteres epithelial cell function and permeability causing secretory diarrhea.
c. Virus evoke fluid secretion by the activation of enteric nervous system in intestinal wall.