This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Misc., Subject name: Microbiology
All are true about Norwalk virus except - 
Select and explain. 
A. Belongs to calciviridae, B. Cultivated in cell culture, C. Causes gasteroenteritis, D. Is a RNA virus
B: Cultivated in cell culture
Answer: B: Cultivated in cell culture 
Explanation: Ans. is 'b' i.e., Cultivated in cell culture "Most calciviruses and astroviruses can be grown in cell culture, but the Norwalk viruses cannot"o Norwalk virus belongs to family calciviridae (RNA viruses) and genus Noroviruses.o Norwalk virus causes outbreast of gastroenteritis from a common source of contamination (water, shellfish, salad).