This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Misc., Subject name: Anatomy
[{'content': 'The arrow indicating the anatomical identification of structure \nSelect and explain. \nA. First ventricle, B. 2nd ventricle, C. 3rd ventricle, D. 4th ventricle', 'role': 'user'}, {'content': 'Answer: C \nExplanation: (C) 3rd ventricle', 'role': 'assistant'}]