Which of the following is an endocrine gland?Multiple ChoicepituitaryadrenalpinealthymusAll of the answer choices are endocrine glands.

To determine which of the given options is an endocrine gland, we need to understand what an endocrine gland is. Endocrine glands are specialized organs that secrete hormones directly into the bloodstream to regulate various bodily functions.

Now, let's analyze the options:

1. Pituitary Gland: Known as the "master gland," it secretes various hormones that control other endocrine glands.
2. Adrenal Gland: Responsible for producing hormones such as adrenaline and cortisol, which help manage stress and metabolic functions.
3. Pineal Gland: Produces melatonin, which regulates sleep cycles.
4. Thymus: Plays a role in immune function by producing thymosin, which aids in the development of T-cells.

Each of these options is indeed an endocrine gland.

Final Answer

All of the answer choices are endocrine glands.