## Core Concept
The major salivary glands in humans are the **parotid**, **submandibular**, and **sublingual glands**. These glands are responsible for producing saliva that aids in digestion, lubrication of food, and maintenance of oral health.

## Why the Correct Answer is Right
The correct answer, , refers to the **parotid**, **submandibular**, and **sublingual glands**, which are indeed the major salivary glands. The option that does not belong with these pairs would be one that either lists non-salivary glands or incorrectly pairs salivary glands.

## Why Each Wrong Option is Incorrect
- **Option A:** - This option lists the **parotid** and **submandibular glands**, both of which are indeed salivary glands.
- **Option B:** - This option lists the **submandibular** and **sublingual glands**, both of which are also salivary glands.
- **Option C:** - This option lists the **parotid** and **sublingual glands**, again both being salivary glands.

## Why the Correct Answer is
- **Option D:** - This option lists **thyroid and adrenal glands**. The **thyroid gland** is an endocrine gland located in the neck that produces thyroid hormones, and the **adrenal glands** are also endocrine glands that produce hormones like adrenaline. Neither of these glands is a salivary gland.

## Clinical Pearl / High-Yield Fact
It's crucial to remember the major salivary glands and their locations: the **parotid glands** are located on either side of the face, below and in front of the ears; the **submandibular glands** are located under the mandible; and the **sublingual glands** are located under the tongue. A classic clinical correlation is that obstruction of the **parotid gland's** duct (Stensen's duct) or the **submandibular gland's** duct (Wharton's duct) can lead to sialadenitis or formation of salivary stones.

**Correct Answer: D. thyroid and adrenal glands**