This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2018, Subject name: Medicine
[{'content': 'In fever of unknown origin, blood sample should be drawn how many times \nSelect and explain. \nA. 2, B. 3, C. 4, D. 5', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Criteria for fever of unknown origin- Fever > 101.30 F on 2 separate occasions For > 3 weeks Absence of immunocompromised state Adequate workup- Blood culture > 3 times should be normal Urine analysis- sterile CRP normal Antinuclear antibody negative LDH normal', 'role': 'assistant'}]