**Core Concept**
The lymphatic drainage of the tongue is complex, involving multiple groups of lymph nodes due to its rich lymphatic network. The **tongue** has a dense network of lymphatic vessels that drain into various lymph node groups. The **lymphatic drainage** of the tongue is divided based on the region of the tongue.

**Why the Correct Answer is Right**
The tip of the tongue drains into the **submental lymph nodes**, which are located under the chin. From there, the lymphatic drainage proceeds to the **submandibular lymph nodes**. The mechanism involves the lymphatic capillaries in the tip of the tongue converging to form larger lymphatic vessels that ultimately drain into these lymph nodes.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately represent the primary lymphatic drainage of the tip of the tongue.
**Option B:** This option is also incorrect as it is not the primary site for lymphatic drainage from the tip of the tongue.
**Option D:** Similarly, this option does not correctly identify the primary lymphatic drainage site for the tip of the tongue.

**Clinical Pearl / High-Yield Fact**
It's crucial to remember that the lymphatic drainage of the tongue can vary based on the region, with the tip draining into the submental nodes, and other parts draining into different groups of lymph nodes.

**Correct Answer:** D. Submental lymph nodes.