<prompt> Answer this question truthfullyWhich is the principal coronary artery situated on the left side of the heart?  <response>: <reason> Shown below are an animated and a static angiography images depicting the left main artery in the RAO caudal view.LAD Left anterior descending artery; LCX Left circumflex artery; LM Left main artery.Shown below are an animated and a static angiography images depicting the left main artery in the LAO cranial view.LAD Left anterior descending artery; LCX Left circumflex artery; LM Left main artery.Shown below are an animated and a static angiography images depicting the left main artery in the LAO caudal view.LAD Left anterior descending artery; LCX Left circumflex artery; LM Left main artery. 