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: Surgery
[{'content': "Aery lying in Guyon's canal is: \nSelect and explain. \nA. Ulnar aery, B. Radial aery, C. Brachial aery, D. Subclan aery", 'role': 'user'}, {'content': "Answer: A \nExplanation: The ulnar aery travels deep to the FCU muscle in the forearm. When the FCU becomes tendinous, the ulnar aery resides deep and slightly radial to it. At the wrist, the aery travels between the hamate and pisiform bones superficial to the transverse carpal ligament (known as Guyon's canal) into the palm. Ref: Schwaz's principle of surgery 9th edition, chapter 44.", 'role': 'assistant'}]