**Core Concept**
Antemortem and postmortem bruises are differentiated based on their histopathological characteristics, which are influenced by the presence of blood circulation and the body's response to injury. Antemortem bruises occur before death and are characterized by hemorrhage, inflammation, and the presence of erythrocytes.

**Why the Correct Answer is Right**
Antemortem bruises show evidence of erythrocyte destruction, with the presence of hemoglobin, hemosiderin, and bilirubin. This is due to the breakdown of red blood cells by macrophages and the subsequent release of these pigments. The presence of these pigments is a key distinguishing feature of antemortem bruises. On the other hand, postmortem bruises lack these features, as the body's circulatory and metabolic processes cease after death.

**Why Each Wrong Option is Incorrect**
**Option A:** Lack of hemorrhage is not a distinguishing feature between antemortem and postmortem bruises, as both can exhibit hemorrhage.
**Option B:** Presence of thrombosis is not a reliable indicator of antemortem vs. postmortem bruises, as it can occur in both scenarios.
**Option C:** Inflammation is a characteristic feature of antemortem bruises, but its absence does not necessarily indicate a postmortem bruise.
**Option D:** The presence of bacteria is not a distinguishing feature between antemortem and postmortem bruises, as both can become contaminated with bacteria post-mortem.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that antemortem bruises often exhibit a zone of hemorrhage surrounded by a zone of congestion, which is due to the release of histamine and other vasoactive substances from damaged tissues. This characteristic can be useful in differentiating antemortem from postmortem bruises.

**Correct Answer: C. Inflammation.**