<prompt> Answer this question truthfullyAccording to the ACC-AHA, what are the characteristics of type A, B, and C coronary lesions in coronary angiography?  <response>: <reason> The standard ACCAHA classification of the primary target stenosis is prospectively modified to subdivide type B stenoses into B1 one adverse characteristic and B2 two adverse characteristics on the basis of previous studies suggesting the cumulative significance of mutiple adverse lesion characteristics. 