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: Forensic Medicine
[{'content': 'Circle of Willis is not formed by: TN 11 \nSelect and explain. \nA. Anterior choroidal aery, B. Anterior cerebral aery, C. Posterior cerebral aery, D. Anterior communicating aery', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Anterior choroidal aery', 'role': 'assistant'}]