This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ear, Subject name: ENT
Postitional veigo is 
Select and explain. 
A. Lateral, B. Superior, C. Inferior, D. Posterior
D: Posterior
Answer: D: Posterior 
Explanation: The disease is caused by the disorder of posterior semicircular canal. Otoconial debris when settles in the cupula of the posterior semicircular canal in a critical head position causes displacement of cupula and veigo. (Ref: Diseases of EAR, NOSE AND THROAT by PL DHINGRA - 6th Edition)