text: The Centers for Disease Control (CDC) describes CFS as a distinct disorder with specific symptoms and physical signs, based on ruling out other possible causes. CFS is diagnosed after excluding other possible causes of<unk> .
  A diagnosis of CFS must mainly based on clinical presentation which includes the:
  absence of other causes of<unk><unk> ,
  at least four CFS-specific symptoms, and
  extreme, long-term<unk> 
  Therefore, there are no specific<unk>  to confirm the diagnosis of CFS.
option_0: Chronic fatigue syndrome laboratory tests
option_1: Parkinson's disease physical examination
option_2: Myasthenia gravis physical examination
option_3: Fibromyalgia physical examination
option_4: Alzheimer's disease physical examination
option_5: Heat stroke screening
option_6: Restless legs syndrome physical examination
option_7: Insomnia physical examination