This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Arboviruses, Subject name: Microbiology
Viruses causing hemorrhagic fever are: 
Select and explain. 
A. Lassa fever virus, B. Yellow fever virus, C. West Nile virus, D. Crimean Congo virus
B: Yellow fever virus
Answer: B: Yellow fever virus 
Explanation: Ans. are 'b' and 'd' i.e., Yellow fever virus, Crimean Congo virus(Ref: Ananthanarayan, 9th/e, p. 522, 523 and 8th/e, p. 520)* Group B arboviruses are JE, Dengue, Westnile virus,Yellow fever and KFD.* Other Viruses causing hemorrhagic fever are - Kyasanur forest disease virus, Omsk hemorrhagic fever virus, Crimean Congo hemorrhagic fever virus.