**Core Concept**
Waldeyer's ring is a ring of lymphoid tissue located in the pharynx, which plays a crucial role in the immune system by providing a first line of defense against pathogens. It consists of several components that work together to maintain pharyngeal immunity.

**Why the Correct Answer is Right**
Waldeyer's ring includes four main components: the palatine tonsils (not mentioned in the options), the lingual tonsil, the nasopharyngeal tonsil (also known as the adenoids), and the tubal tonsil. The lingual tonsil is located on the back of the tongue, the nasopharyngeal tonsil is located in the roof of the nasopharynx, and the tubal tonsil is located near the opening of the Eustachian tube. All these components are interconnected and work together to form a protective barrier against infections.

**Why Each Wrong Option is Incorrect**
* **Option A:** The lingual tonsil is indeed a component of Waldeyer's ring, so this option is incorrect because it is partially correct.
* **Option B:** The nasopharyngeal tonsil is also a component of Waldeyer's ring, so this option is incorrect because it is partially correct.
* **Option C:** The tubal tonsil is a component of Waldeyer's ring, so this option is incorrect because it is partially correct.

**Clinical Pearl / High-Yield Fact**
Waldeyer's ring is named after Wilhelm Waldeyer, a German anatomist who first described it in the late 19th century. It is an important concept to remember in the context of pharyngeal immunity and the development of certain types of head and neck cancers.

**✓ Correct Answer: D. All of the above**