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: Anatomy
[{'content': 'All of the following arteries are common sites of occlusion by a thrombus except - \nSelect and explain. \nA. Anterior interventricular, B. Posterior interventricular, C. Cirucumflex, D. Marginal', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Thrombus is not common in marginal artery.', 'role': 'assistant'}]