**Core Concept**
The question is testing the concentration of fluoride in a specific dental topical application, which is an essential aspect of dental pharmacology. Stannous fluoride is a compound used in dental care for its antibacterial and anti-plaque properties.

**Why the Correct Answer is Right**
Stannous fluoride is a topical application used in dental care, and its fluoride concentration is crucial for its effectiveness. The correct concentration of fluoride in 8% stannous fluoride is 8%, which is equivalent to 22,600 ppm (parts per million) or 22.6 mg/mL. This concentration is essential for the compound's antibacterial and anti-plaque properties.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not specify the concentration of fluoride in stannous fluoride.
* **Option B:** This option is incorrect because it does not accurately represent the concentration of fluoride in stannous fluoride.
* **Option D:** This option is incorrect because it is not a valid concentration of fluoride in stannous fluoride.

**Clinical Pearl / High-Yield Fact**
When using stannous fluoride, it's essential to note that the concentration of fluoride is critical for its effectiveness in preventing dental caries and promoting oral health. A concentration of 8% stannous fluoride is commonly used in dental care products.

**Correct Answer:** C. 8%