This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hepatitis Viruses, Subject name: Microbiology
Virus causing Latent infection (or Latent period is shown by which virus) - 
Select and explain. 
A. Rubella, B. HBV, C. Pertussis, D. Rota virus
B: HBV
Answer: B: HBV 
Explanation: Ans. is 'b' i.e., HBV [Ref: Harrison 18th/ep. 1438: 17th/e p. 1084)Latent infection is caused byo HBVo HCVo Rabies Viruso Measles Viruso HIVo HTLVo HPVo HSVo VZVo Some pox viruseso EBVo CMVo HHV-6. HHV-7, HHV-8(Human Herpes Virus)