**Core Concept**
Cadaveric lividity, also known as post-mortem lividity or livor mortis, is the discoloration of the skin due to the pooling of blood in the dependent areas after death. The color of lividity can provide valuable information about the cause of death, particularly in cases of poisoning.

**Why the Correct Answer is Right**
The bluish-green color of cadaveric lividity is typically associated with copper poisoning, also known as acute copper sulfide poisoning. This occurs when copper is ingested in large quantities, often through the consumption of contaminated food or water. The copper ions then react with the sulfhydryl groups in the blood, forming a copper sulfide complex that gives the blood a bluish-green color. This is because the copper ions bind to the hemoglobin in the red blood cells, causing a shift in the oxyhemoglobin dissociation curve and a subsequent change in the color of the blood.

**Why Each Wrong Option is Incorrect**
**Option A:** Cyanide poisoning typically causes a bright red or pink color of the skin due to the inhibition of cellular respiration and the subsequent accumulation of oxygen-rich blood in the tissues.

**Option B:** Carbon monoxide poisoning would cause a bright red or cherry-red color of the skin due to the formation of carboxyhemoglobin, which has a higher affinity for oxygen than hemoglobin.

**Option C:** Arsenic poisoning can cause a range of color changes, including a pink or red color, but is not typically associated with a bluish-green color.

**Clinical Pearl / High-Yield Fact**
In cases of suspected poisoning, it is essential to examine the color of the cadaveric lividity, as well as other post-mortem findings, to determine the likely cause of death.

**Correct Answer:** C.