**Core Concept**
Dental plaque is a biofilm composed of microorganisms and carbohydrate deposits, which adheres to tooth surfaces. The types of carbohydrates present in dental plaque are primarily derived from the host's diet and saliva.

**Why the Correct Answer is Right**
Dental plaque contains various types of carbohydrates, including sucrose, glucose, and fructose, which serve as energy sources for the microorganisms. These carbohydrates are broken down into simpler sugars by enzymes produced by the bacteria, such as sucrase and invertase. The breakdown products then provide energy for the growth and proliferation of the microorganisms, leading to the formation of dental plaque.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because, although the specific type of carbohydrate is not mentioned, it is a common component of dental plaque. Dental plaque contains various types of carbohydrates, including sucrose, glucose, and fructose.
* **Option B:** This option is incorrect because, although dental plaque is primarily composed of carbohydrates, it also contains other components such as bacteria, proteins, and minerals. However, the presence of other components does not negate the fact that carbohydrates are a primary component of dental plaque.
* **Option D:** This option is incorrect because, although saliva contains various types of carbohydrates, such as mucins and glycoproteins, these are not the same as the carbohydrates found in dental plaque.

**Clinical Pearl / High-Yield Fact**
Dental plaque is a dynamic biofilm that forms on tooth surfaces in the presence of a susceptible host and an adequate supply of carbohydrates. Regular removal of dental plaque through brushing and flossing is essential for preventing dental caries and periodontal disease.

**Correct Answer: C. Water**