**Core Concept**
Carbon monoxide (CO) poisoning occurs when carbon monoxide binds to hemoglobin in red blood cells, forming carboxyhemoglobin (COHb). This reduces the oxygen-carrying capacity of the blood, leading to tissue hypoxia. The affinity of CO for hemoglobin is 210 times greater than that of oxygen.

**Why the Correct Answer is Right**
In carbon monoxide poisoning, the characteristic cherry-red discoloration of the skin, mucous membranes, and organs is due to the formation of carboxyhemoglobin. This is a result of the high affinity of CO for hemoglobin, which leads to a significant shift in the oxygen-hemoglobin dissociation curve. The presence of CO also leads to a decrease in the level of 2,3-bisphosphoglycerate (2,3-BPG), a molecule that helps regulate hemoglobin's oxygen affinity.

**Why Each Wrong Option is Incorrect**
**Option A:** Carbon monoxide poisoning does not typically cause a decrease in blood pressure, as the primary effect is on oxygen delivery to tissues, not on vascular tone.
**Option B:** The presence of a cherry-red discoloration is a key finding in carbon monoxide poisoning, making this option incorrect.
**Option C:** Carbon monoxide poisoning can cause damage to the central nervous system, heart, and other organs due to tissue hypoxia, but this option is too vague to be correct.

**Clinical Pearl / High-Yield Fact**
In cases of suspected carbon monoxide poisoning, pulse oximetry may not accurately reflect the patient's oxygen saturation, as the device may not be able to distinguish between oxyhemoglobin and carboxyhemoglobin.

**Correct Answer:** B.