**Core Concept**
Red man syndrome is a condition characterized by flushing, erythema, and pruritus that occurs after the administration of certain medications, particularly vancomycin. This syndrome is a manifestation of histamine release and is often associated with rapid infusion rates.

**Why the Correct Answer is Right**
Vancomycin is a glycopeptide antibiotic that can cause the release of histamine from mast cells, leading to the symptoms of red man syndrome. The rapid infusion of vancomycin is thought to overwhelm the body's ability to metabolize histamine, resulting in the characteristic symptoms. This is a classic example of an anaphylactoid reaction, which is distinct from a true anaphylactic reaction.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not relevant to the question and does not describe a medication that is commonly associated with red man syndrome.
**Option B:** While this medication may have other side effects, it is not typically associated with red man syndrome.
**Option C:** This option is incorrect because it does not describe a medication that is commonly associated with red man syndrome.

**Clinical Pearl / High-Yield Fact**
To prevent red man syndrome, vancomycin should be infused over a period of at least 60 minutes, and the rate should be adjusted based on the patient's response.

**Correct Answer: A. Vancomycin.