<prompt> All of the following are true about coronary aery except:Right coronary aery lies in right anterior coronary sulcusLeft anterior descending aey is a branch of left coronary aeryUsually 3 obtuse marginal aeries arise from left coronary aeryIn 85 cases posterior descending interventri-cular aery arises from right co. a.  <response>: C i.e. Usually 3 obtuse marginal aeries arise form left coronary aery 