<prompt> Most common cause of postural hypotension isProgressive cerebellar degenerationStriatonigral degenerationPeripheral neuropathyAdrenal insufficiency  <response>: C Peripheral neuropathy Causes of postural syncope: In patients receiving antihypertensive or vasodilator drugs and those who are hypovolemic because of diuretics, excessive sweating, diarrhea, vomiting, hemorrhage, or adrenal insufficiency. 