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: Pathology
Most common site of berry's aneurysm is? 
Select and explain. 
A. Veebral aery, B. Basilar aery, C. Junction of anterior cerebral aery and anterior communicating aery, D. Posterior cerebral aery
C: Junction of anterior cerebral aery and anterior communicating aery
Answer: C: Junction of anterior cerebral aery and anterior communicating aery 
Explanation: Ans. is 'c' i.e., Junction of anterior cerebral aery and anterior communicating aeryBerry aneurysm The fuher away the aneurysm from the anterior circulation or from the circle of willis , the less common will be its rate of occurance.Berry aneurysm or Saccualr aneurysm or Congenital aneurysm is the most frequent type of intracranial aneurysm. Most aneurysms occur in the anterior circulation and are found near the branchs points.Most common site is junction between anterior cerebral aery and anterior communication aery (40%). Next most common site is internal carotid aery and posterior communicating aery (20%)Less frequent sites include :?Top of basilar aeryJunction of basilar aery and the superior cerebllar aery or anterior inferior cerebellar aery. Junction of veebral aery and posterior inferior cerebellar aery.