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
Which test is not useful in a patient with history of syncopal attack - 
Select and explain. 
A. Electrophyciological test, B. Table tilt test, C. PET scan, D. Holier monitoring
C: PET scan
Answer: C: PET scan 
Explanation: None