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
[{'content': 'Pineal gland forms \nSelect and explain. \nA. Floor of third ventricle, B. Anterior wall of third ventricle, C. Posterior wall of third ventricle, D. Roof of third ventricle', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 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', 'role': 'assistant'}]