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: Medicine
The definition of pyrexia of unknown origin includes all except: 
Select and explain. 
A. Diagnosis requires fever persisting for 3 weeks, B. Fever undiagnosed after 1 week of in-patient workup, C. Absence of immunological compromise, D. Temperature of 38.3degC or more
B: Fever undiagnosed after 1 week of in-patient workup
Answer: B: Fever undiagnosed after 1 week of in-patient workup 
Explanation: Answer- B. Fever undiagnosed after 1 week of in-patient workupAccording to new definition of fever of unknown origin,fever undiagnosed after I week of in-patient work up is not included.