Bullet entry wound, for bullet entering at acute angle is identified by what shape of abrasion collar ?
**Core Concept**
The question tests the understanding of forensic pathology, specifically the characteristics of gunshot wounds. An **abrasion collar** is a region of abrasion around the entrance wound, caused by the bullet scraping against the skin as it enters. The shape of the abrasion collar can indicate the angle of entry.
**Why the Correct Answer is Right**
When a bullet enters the skin at an **acute angle**, the abrasion collar is typically **elliptical** in shape. This is because the bullet is presenting a larger surface area to the skin as it enters, resulting in an elongated abrasion pattern. The elliptical shape can help forensic pathologists determine the direction of fire.
**Why Each Wrong Option is Incorrect**
**Option A:** A circular abrasion collar is more characteristic of a bullet entering at a **perpendicular angle**.
**Option B:** A rectangular abrasion collar is not a typical description of an entrance wound.
**Option D:** A triangular abrasion collar is not commonly associated with bullet entry wounds.
**Clinical Pearl / High-Yield Fact**
In forensic pathology, the shape and size of the abrasion collar can provide valuable information about the circumstances of a shooting. An elliptical abrasion collar is a key indicator of a bullet entering at an acute angle.
**Correct Answer:** D. Elliptical