**Core Concept**
The vestibular system is responsible for balance and spatial orientation, and certain antibiotics can cause vestibular toxicity, leading to symptoms such as vertigo, dizziness, and ataxia. This is often due to the antibiotic's ability to bind to calcium ions, which are essential for the proper functioning of the vestibular system.

**Why the Correct Answer is Right**
The correct answer is Demeclocycline, a tetracycline antibiotic that has a higher affinity for calcium ions compared to other tetracyclines. This increased affinity for calcium ions leads to its ability to cause vestibular toxicity, making it a notable exception among tetracyclines. Demeclocycline's unique mechanism of action involves the inhibition of the 50S subunit of the bacterial ribosome, which is a common target for tetracyclines.

**Why Each Wrong Option is Incorrect**
**Option A:** Minocycline is a tetracycline antibiotic that is often used to treat acne and other skin infections. While it can cause a range of side effects, vestibular toxicity is not typically associated with minocycline use.
**Option B:** Doxycycline is another tetracycline antibiotic that is commonly used to treat a variety of infections. Doxycycline is not known to cause vestibular toxicity, and its side effect profile is generally well-tolerated.
**Option C:** Tetracycline is the parent compound of the tetracycline class, and while it can cause a range of side effects, vestibular toxicity is not typically associated with tetracycline use.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that Demeclocycline's unique mechanism of action and high affinity for calcium ions make it a notable exception among tetracyclines, and its use should be approached with caution, especially in patients with a history of vestibular disorders.

**Correct Answer: C. Tetracycline. Demeclocycline.**