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: Medicine
Commonest site of aneurysm is - 
Select and explain. 
A. Middle cerebral artery, B. Vertebrobasilar system, C. Anterior communicating artery, D. Internal carotid artery
C: Anterior communicating artery
Answer: C: Anterior communicating artery 
Explanation: None