Question

what structure is most commonly involved in bppv?
anterior semicircular canal
utricle
saccule
posterior semicircular canal

Explanation:

Benign paroxysmal positional vertigo (BPPV) is a common cause of vertigo. It is most commonly associated with the posterior semicircular canal. This is because the posterior semicircular canal is more prone to the displacement of otoconia (small calcium carbonate crystals) which is a key mechanism in BPPV. The anterior semicircular canal involvement is much less common. The utricle and saccule are part of the otolith organs but are not the most commonly affected structures in BPPV compared to the posterior semicircular canal.

Answer:

Posterior semicircular canal