**Core Concept:** Dum-Dum bullets are a type of ammunition designed to expand upon entry into the body, causing significant tissue damage and thus increasing the injury potential. They were developed in the Dum Dum region (now in India), hence the name.

**Why the Correct Answer is Right:** The correct answer, Dum-Dum bullets, are specifically designed to expand upon entering the body, leading to increased tissue damage and overall injury. This design feature is crucial to their functionality as weapons.

**Why Each Wrong Option is Incorrect:**

A. **Option A:** Traditional bullets (non-expanding) do not expand upon entry into the body, which reduces their injury potential compared to Dum-Dum bullets.

B. **Option B:** Gas-powered bullets are unrelated to the question, as they are unrelated to the expansion of bullets upon entry into the body.

C. **Option C:** Steel bullets do not explain the expansion aspect of Dum-Dum bullets; rather, they are typically made of copper or lead, with the expansion mechanism being the key feature of Dum-Dum bullets.

**Clinical Pearl / High-Yield Fact:** The concept of Dum-Dum bullets highlights the importance of understanding the design features of various types of ammunition, particularly in forensic medicine and ballistics. This knowledge can be valuable in identifying the type of bullet used in a case, which can provide critical information for investigation, prosecution, and patient care.