**Core Concept**
Mercury poisoning is a toxicological condition caused by the ingestion or inhalation of mercury compounds. The primary mechanism of mercury toxicity involves the disruption of cellular function and the generation of reactive oxygen species (ROS) through the binding of mercury ions to sulfhydryl groups in proteins and enzymes.

**Why the Correct Answer is Right**
The correct answer is related to the inhibition of the enzyme cysteine protease, specifically the cathepsin B enzyme. Mercury ions bind to the sulfhydryl group of cysteine residues in cathepsin B, leading to enzyme inhibition and subsequent disruption of cellular function. This inhibition of cathepsin B contributes to the pathogenesis of mercury toxicity, particularly in the kidneys and central nervous system.

**Why Each Wrong Option is Incorrect**
**Option A:** Mercury poisoning is not primarily associated with the inhibition of acetylcholinesterase, as seen in organophosphate poisoning.
**Option B:** Mercury ions do not primarily bind to the sulfhydryl group of glutathione, although glutathione conjugation is an important mechanism for mercury detoxification.
**Option C:** Mercury poisoning is not primarily associated with the inhibition of cytochrome P450 enzymes, as seen in certain cases of drug toxicity.

**Clinical Pearl / High-Yield Fact**
Mercury toxicity can be treated with chelating agents such as succimer or penicillamine, which can help to bind and remove mercury ions from the body. However, these agents should be used with caution and under close medical supervision.

**Correct Answer:** D.