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 calcivirus? \nSelect and explain. \nA. HEV, B. HBV, C. HCV, D. HAV', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) HEV According to Ananthanarayan 9/e, p 550 "HEV has been classified in genus hepesvirus under family calciviridae." But according to Harrison 18/e 2543 "HEV although resembling calicivirus is sufficiently distinct from any known agent to merit a new classification of its own as a unique genus; Hepevirus with in the family Hepeviridae."', 'role': 'assistant'}]