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
All are true about chronic fatigue syndrome except: 
Select and explain. 
A. For diagnosis, duration of fatigue should be atleast 6 month, B. Impaired memory and concentration may present, C. Fatigue relieved by rest, D. Physical examination shows no abnormalities
C: Fatigue relieved by rest
Answer: C: Fatigue relieved by rest 
Explanation: Answer- C. Fatigue relieved by restFatigue lasts for at least 6 monthsFatigue is of new or definite onset.Fatigue is not the result of an organic disease or ofcontinuing exeionFatigue is not alleted by rest.Fatigue symptoms are soar throat, tender cervical or axilary lymph nodes, muscle pain, pain in several joints, headaches, malaise