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: Anatomy
[{'content': 'Floor of body of lateral ventricle is formed by \nSelect and explain. \nA. Septum pellucidum, B. Rostrum of corpus callosum, C. Thalamostriate  vein, D. Genu of corpus callosum', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Floor of body of lateral ventricle is formed by\xa0\n\nCaudate nucleus\nThalamostriate vein\nThalamus upper\xa0 surface\xa0\nBody of fornix upper surface\n\nRostrum of corpus callosum forms floor, septum pellucidum forms medial wall, and genu of corpus callosum forms anterior wall of anterior horn of lateral ventricle.', 'role': 'assistant'}]