This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Brain , Subject name: Anatomy
Pineal gland forms 
Select and explain. 
A. Floor of third ventricle, B. Anterior wall of third ventricle, C. Posterior wall of third ventricle, D. Roof of third ventricle
C: Posterior wall of third ventricle
Answer: C: Posterior wall of third ventricle 
Explanation: Anterior wall :Anterior column of fornixAnterior commissureLamina terminalisPosterior wall:Pineal glandPosterior commissureCommencement of cerebral aqueduct.Roof: ependymaFloor:Optic chiasmaTuber cinereumMamillary bodiesPosterior perforated substanceTegmentum of midbrainLateral wall:ThalamusHypothalamusRef: Vishram Singh textbook of clinical neuroanatomy second edition pg 137