**Core Concept**
Ulnar nerve injury can result in a range of clinical manifestations due to its involvement in motor and sensory innervation of the forearm and hand. The ulnar nerve is responsible for controlling the intrinsic muscles of the hand, specifically those involved in fine motor movements, as well as providing sensation to the little finger and half of the ring finger.

**Why the Correct Answer is Right**
The correct answer will be a symptom or sign not typically associated with ulnar nerve injury. Ulnar nerve injury is often characterized by the "claw hand" deformity, weakness in grip strength, and impaired sensation in the distribution of the ulnar nerve. The ulnar nerve also innervates the interosseous muscles and the adductor pollicis muscle, which are involved in thumb adduction and finger spreading.

**Why Each Wrong Option is Incorrect**
**Option A:** This option might be a sign of ulnar nerve injury, such as the claw hand deformity, which results from weakness of the interosseous muscles and the adductor pollicis muscle.
**Option B:** Ulnar nerve injury can cause weakness in grip strength, as the ulnar nerve innervates the intrinsic muscles of the hand involved in grip.
**Option C:** This option might be a sign of ulnar nerve injury, such as impaired sensation in the distribution of the ulnar nerve, specifically affecting the little finger and half of the ring finger.

**Clinical Pearl / High-Yield Fact**
When examining a patient for ulnar nerve injury, it's essential to assess for the presence of a positive Froment's sign, which involves asking the patient to hold a piece of paper between their thumb and index finger. A positive Froment's sign indicates weakness of the adductor pollicis muscle, suggesting ulnar nerve injury.

**Correct Answer:** D