**Core Concept**
The underlying principle being tested is the difference between **plaque** and **materia alba** in the context of dental health. **Plaque** is a biofilm of bacteria that forms on teeth, while **materia alba** refers to loose, whitish deposits on the teeth.

**Why the Correct Answer is Right**
Since the correct answer is not provided, let's discuss the general differences. Plaque is a sticky, colorless film that adheres to teeth, both above and below the gum line, and is composed of bacteria and their products. It is the primary cause of **gingivitis** and can lead to **periodontitis** if not removed. Materia alba, on the other hand, is composed of food particles, dead cells, and other debris.

**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific details of option A, we cannot directly address why it is incorrect.
**Option B:** Similarly, without the specifics of option B, its incorrectness cannot be explained.
**Option C:** And option C's incorrectness also cannot be detailed without its content.
**Option D:** The same applies to option D.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that while both plaque and materia alba can accumulate on teeth, only plaque is firmly attached and requires professional cleaning for removal. Regular brushing and flossing can help prevent plaque buildup.

**Correct Answer:** Correct Answer: D. Composition and adherence.