This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Brain Hemorrhage, Subject name: Medicine
Which of the following is the most common site of aneurysmal subarachnoid hemorrhage? 
Select and explain. 
A. Anterior communicating aery, B. Basilar aery, C. Posterior communicating aery, D. Middle cerebral aery
A: Anterior communicating aery
Answer: A: Anterior communicating aery 
Explanation: Berry aneurysms are most common in anterior circulatation. (Overall) MC site of aneurysmal SAH: Anterior communicating aery causing worst headache of life. If in the question mentioned 3rd nerve is involved and site was asked : (PCA) Post Communicating Aery ,would be the answer.