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: ENT
A fifty-year-old man, presents to his local physician complaining that he often feels as if the room is spinning when he gets up from a recumbent position or turns his head. He has not lost consciousness and has had no chest pain. He has no cardiac history and a recent treadmill test showed no abnormalities. On examination, the sensation can be produced by rapidly turning the head. It can be reproduced many times, but it eventually ceases. Nystagmus is elicited. Hearing is normal. Which of the following is the most likely mechanism for this patient's symptoms? 
Select and explain. 
A. Aberrant stimulation of hair cells, B. Hair cell death in the semicircular canals, C. Insufficient cardiac output, D. Insufficient cerebral perfusion
A: Aberrant stimulation of hair cells
Answer: A: Aberrant stimulation of hair cells 
Explanation: In benign paroxysmal positional veigo, calcium carbonate crystals called otoliths, which are usually fixed in a gelatinous otolithic membrane, float freely in the endolymph. Usually, movement is sensed by the movement of this heavy membrane as it stimulates hair-like projections on sensory hair cells fixed to the membrane in the inner ear. In BPPV, the loose crystals aberrantly stimulate the hair cells with ceain head movements. Thus the sensation of veigo is produced. Hair cell death does not cause veigo. Insufficient cardiac output and cerebral blood flow lead to syncope and not veigo.