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': 'Cystic aery is usually derived from: \nSelect and explain. \nA. Right hepatic aery, B. Left hepatic aery, C. Left gastric aery, D. None of the above', 'role': 'user'}, {'content': "Answer: A \nExplanation: The cystic aery usually arises from the right hepatic aery. It usually passes posterior to the common hepatic duct and anterior to the cystic duct to reach the superior aspect of the neck of the gallbladder. It divides into superficial and deep branches. Ref: Gray's anatomy 40th edition, Chapter 86.", 'role': 'assistant'}]