This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Upper limb, Subject name: Anatomy
[{'content': 'The term "Guyon&;s canal" is in relation to which of the following? \nSelect and explain. \nA. Anterior interosseus nerve, B. Ulnar nerve, C. Median nerve, D. Radial aery', 'role': 'user'}, {'content': "Answer: B \nExplanation: Guyon's canal or ulnar tunnel is an osseofibrous tunnel formed by the pisohamate ligament bridging the concavity formed by the pisiform bone and hook of the hamate. The ulnar a nerve passes through this tunnel in the wrist and its compression here lead to ulnar tunnel syndrome characterised by hypoesthesia of medial 1 and 1/2 fingers and weakness of intrinsic muscles of the hand. Ref: Textbook of anatomy upper limb and thorax, Vishram Singh, 2nd edition, page no.150, 180", 'role': 'assistant'}]