**Core Concept**
The Guyon's canal, also known as the ulnar canal, is a narrow anatomical passage in the wrist that transmits the ulnar nerve and associated vessels. It is located on the ulnar (medial) aspect of the wrist, proximal to the pisiform bone.

**Why the Correct Answer is Right**
The Guyon's canal transmits the ulnar nerve, which is responsible for innervating muscles and providing sensation to the ulnar side of the hand. The ulnar nerve also gives off branches to the pisiform, flexor carpi ulnaris, and the ulnar half of the flexor digitorum profundus. The correct structures passing through the Guyon's canal include the ulnar nerve, ulnar artery, and ulnar vein.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not provided, please provide the actual options.
* **Option B:** This option is also not provided, please provide the actual options.
* **Option D:** This option is also not provided, please provide the actual options.

**Clinical Pearl / High-Yield Fact**
The Guyon's canal is a common site for compression of the ulnar nerve, leading to symptoms such as numbness, tingling, and weakness of the hand. This condition is often referred to as Guyon's canal syndrome.

**Correct Answer: D.**