**Core Concept**
The distal radial tubercle, also known as Lister's tubercle, is a bony prominence on the radius bone in the forearm. The anatomy of this region is crucial for understanding the relationships between various tendons and muscles. The question requires knowledge of the spatial arrangement of these structures.

**Why the Correct Answer is Right**
The extensor carpi radialis longus (ECRL) tendon lies lateral to the distal radial tubercle. This tendon is responsible for wrist extension and radial deviation. The ECRL tendon is anchored to the base of the second metacarpal bone in the hand. Its location relative to Lister's tubercle is essential for its functional role in wrist movement. The ECRL muscle originates from the lateral supracondylar ridge of the humerus and inserts into the base of the second metacarpal bone.

**Why Each Wrong Option is Incorrect**
**Option A:** The extensor pollicis longus tendon is responsible for thumb extension and does not lie lateral to the distal radial tubercle.

**Option C:** The brachioradialis muscle is involved in forearm flexion and does not have a direct relationship with the distal radial tubercle.

**Option D:** The extensor carpi ulnaris tendon is responsible for wrist extension and ulnar deviation, and it lies medial to the distal radial tubercle, not lateral.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the relationships between tendons and bones in the forearm are critical for understanding wrist and hand function. The ECRL tendon's position relative to Lister's tubercle is a key anatomical landmark for surgeons and clinicians.

**✓ Correct Answer: B. Extensor carpi radialis longus**