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 among the following is the only hepatitis virus which can be cultured? \nSelect and explain. \nA. HAV, B. HBV, C. HDV, D. HCV', 'role': 'user'}, {'content': 'Answer: A \nExplanation: HAV can be cultured from the feces of infected individuals. Comparison of A, B, D, C, and E Hepatitis FEATURE A B C E Virus type Single-stranded RNA Double-stranded DNA RNA RNA Incubation period (days) 15-45 (mean, 25) 30-180 (mean, 60-90) 15-150 (mean 50) 21-56 (mean 40) Onset Usually sudden Usually slow Insidious Age preference Children, young adults All ages All ages Young adult Transmission Fecal-oral +++ +- - +++ Sexual + ++ + +? Parenteral - +++ +++ Chronicity (%) None 10 85 Rare Carrier state None Yes Yes No Immune serum globulin protective Yes Yesb No No Vaccine Yes Yes No No Ref: Maternal and Child Health Nursing By Adele Pillitter page 1135. Ray C.G., Ryan K.J. (2010). Chapter 13. Hepatitis Viruses. In C.G. Ray, K.J. Ryan (Eds), Sherris Medical Microbiology, 5e.', 'role': 'assistant'}]