**Core Concept**
Vossius ring is a specific type of ocular injury that results from a blunt trauma to the eye, typically caused by a direct blow to the cornea. This leads to a characteristic ring-shaped injury to the anterior lens capsule, which is an essential component of the eye's crystalline lens.

**Why the Correct Answer is Right**
In a concussion injury, the force of the blow to the eye causes a pressure wave that propagates through the ocular tissues. This pressure wave can lead to a rupture of the anterior lens capsule, resulting in a Vossius ring. The ring-shaped injury is a result of the pressure wave causing a focal disruption of the lens capsule, leading to the characteristic appearance of a Vossius ring. The anterior lens capsule is particularly susceptible to this type of injury due to its thin and delicate nature.

**Why Each Wrong Option is Incorrect**
**Option A:** Lens dislocation is a different type of ocular injury that occurs when the lens is displaced from its normal position within the eye. While lens dislocation can result from trauma, it is not directly associated with the formation of a Vossius ring.

**Option C:** Penetrating injury is a type of ocular trauma that involves a breach in the integrity of the eye's outer structures. While penetrating injuries can result in a range of complications, including lens damage, they are not typically associated with the formation of a Vossius ring.

**Option D:** Extra capsular extraction is a surgical procedure used to remove the lens in cases of cataract. While this procedure involves manipulation of the lens capsule, it is not associated with the formation of a Vossius ring.

**Clinical Pearl / High-Yield Fact**
A Vossius ring is often accompanied by other signs of blunt ocular trauma, including corneal edema, hyphema, and ciliary flush. Recognizing the characteristic appearance of a Vossius ring can be an important diagnostic clue in cases of suspected ocular trauma.

**✓ Correct Answer: B. Concussion injury**