This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
Neurocardiagenic syncope, the least useful investigation is - 
Select and explain. 
A. Tilt table, B. Carotid sinus massage, C. Carotid duplex scan, D. Ohostatic blood pressure recording
A: Tilt table
Answer: A: Tilt table 
Explanation: An MRI scan is an imaging test used to show internal structures of your body, such as your spine. It can help to detect any irregularities with your spinal column. Combined with an evaluation of your symptoms, your doctor can use an MRI scan to diagnose the source of your back pain and neurogenic shock immobilize you to prevent fuher damage. Then they will give you fluids intravenously to regulate your blood pressure. If your blood pressure is too low, you may be given vasopressors, or medication that helps to tighten your blood vessels and raise pressure. Ref Davidson 23rd edition pg 456