<prompt> Answer this question truthfullyWhat are the three components used in the Spetzler-Martin classification system for brain arteriovenous malformations AVMs?  <response>: <reason> The three components used in the Spetzler-Martin classification system for brain AVMs are size maximum diameter, location eloquence of adjacent brain tissue, and the presence of venous drainage. Each component is assigned a score of 1-3, and the scores are added together to determine the overall risk of surgical treatment. The maximum score is 5, which indicates the highest risk for surgery. 