This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
[{'content': 'If circumflex aery gives the posterior intervenetricular branch, this circulation is described as: \nSelect and explain. \nA. Right dominance, B. Left dominance, C. Codominance, D. Undetermined', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Answer is B (Left dominance):', 'role': 'assistant'}]