**Core Concept**
Submandibular nodes are a group of lymph nodes located in the submandibular region, which plays a crucial role in the immune response of the head and neck. These nodes are part of the superficial cervical lymphatic drainage system and are involved in the filtration of lymph fluid from the anterior two-thirds of the tongue, the floor of the mouth, and the anterior part of the oral cavity.

**Why the Correct Answer is Right**
Submandibular nodes are classified as **inguinal-type lymph nodes**, meaning they have a similar structure and function to the inguinal lymph nodes found in the groin. This classification is based on their location, size, and the type of lymphatic vessels that drain into them. The submandibular nodes receive lymph from the anterior two-thirds of the tongue, the floor of the mouth, and the anterior part of the oral cavity via the submandibular lymphatic vessels. This classification is important for understanding the lymphatic drainage of the head and neck and for identifying potential sites of metastasis in cancer patients.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the classification of submandibular nodes.
**Option B:** This option is incorrect because it is a classification based on the location of the nodes, not their structure or function.
**Option C:** This option is incorrect because it refers to a different group of lymph nodes altogether.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the submandibular nodes are involved in the superficial cervical lymphatic drainage system and can be a site of metastasis for cancers of the head and neck, such as oral squamous cell carcinoma.

**Correct Answer:** C.