**Core Concept**
In forensic medicine, ligature marks on the neck caused by hanging are a result of external pressure exerted by the ligature on the skin, leading to the formation of specific types of skin injuries.

**Why the Correct Answer is Right**
The correct answer is **B. Pressure abrasion** because when a ligature is applied to the neck, it exerts pressure on the skin, causing the superficial layers of the skin to be scraped away, resulting in an abrasion. This is a type of non-penetrating injury that occurs due to friction between the ligature and the skin. The pressure exerted by the ligature can also cause the skin to become compressed, leading to the formation of a linear mark.

**Why Each Wrong Option is Incorrect**
**Option A:** A contusion is a type of bruise that results from bleeding into the skin due to trauma, which is not the case with ligature marks on the neck. Contusions typically occur due to blunt trauma, not pressure.

**Option C:** A laceration is a type of cut or tear in the skin caused by sharp objects, which is not the case with ligature marks on the neck. Lacerations typically occur due to sharp trauma, not pressure.

**Option D:** A bruise is a type of contusion that results from bleeding into the skin due to trauma, which is not the case with ligature marks on the neck. Bruises typically occur due to blunt trauma, not pressure.

**Clinical Pearl / High-Yield Fact**
In forensic medicine, the presence of ligature marks on the neck is often used as evidence of hanging, but it's essential to note that these marks can also occur due to other causes, such as strangulation or self-inflicted injuries. A thorough investigation and examination of the scene and the body are necessary to determine the cause of death.

**✓ Correct Answer: B. Pressure abrasion**