**Core Concept**
Topical vasoconstrictors are used to reduce bleeding in mucous membranes by constricting blood vessels. These agents have high surface activity, allowing them to rapidly penetrate and act on the targeted area.

**Why the Correct Answer is Right**
The correct answer, Oxymetazoline, is a potent vasoconstrictor that reduces bleeding in mucous membranes by causing blood vessel constriction. It works by stimulating alpha-adrenergic receptors in the blood vessel walls, leading to vasoconstriction. Oxymetazoline's high surface activity allows it to quickly penetrate the mucous membrane and exert its effects.

**Why Each Wrong Option is Incorrect**
**Option A:** Phenylephrine is another vasoconstrictor, but it is primarily used in ophthalmology to dilate pupils, not to reduce bleeding in mucous membranes.
**Option B:** Cocaine has vasoconstrictive properties, but its primary use is as a local anesthetic in ophthalmology and otolaryngology. Its vasoconstrictive effects are not as potent as Oxymetazoline's.
**Option C:** Tetracaine is a local anesthetic, not a vasoconstrictor, and is used to prevent pain during minor surgical procedures.

**Clinical Pearl / High-Yield Fact**
When using topical vasoconstrictors like Oxymetazoline, be aware of the risk of rebound congestion and tachyphylaxis with prolonged use.

**Correct Answer: C. Oxymetazoline**