<s>[INST] context: In 8% of cases the left coronary aery (LCA) is dominant because it gives of the posterolateral aery (PLA) and then travels to the cross-section of the AV groove and the posterior interventricular (IV groove) where it gives rise to the left posterior descending coronary aery (PDA) that travels in the posterior IV groove and gives off several septal perforator branches (SP). The SP supply blood to the lower poion of the IV septum.In 85% of patients the right coronary aery (RCA) is said to be "dominant" because it supplies circulation to the inferior poion of the interventricular septum the right posterior descending coronary aery or PDA branch. In these cases the RCA travels to the cross-section of the AV groove and the posterior interventricular (IV groove). Here, it gives rise to the right posterior descending coronary aery (PDA) branch which travels in the posterior IV groove and gives off several septal perforator branches (SP). The SP supply blood to the lower poion of the IV septum. Generally, the dominant RCA also gives rise to the AV nodal branch which supplies blood to the AV node. [/INST] question: If circumflex aery gives the posterior interventricular branch, this circulation is described as? | options: A: Right dominance B: Left dominance C: Codominance D: Undetermined | answer: B </s>