Which of the following endocrine glands is not found in pair in

Which of the following endocrine glands is not found in pair in humans?

Adrenal
Pituitary
Testis
Ovary
This question was previously asked in
UPSC CDS-1 – 2020
Most major endocrine glands in the human body are either single structures or paired. Let’s examine the options: Adrenal glands are located on top of each kidney, hence there is a pair. Testes are the male gonads, typically a pair. Ovaries are the female gonads, typically a pair. The pituitary gland is located at the base of the brain, inferior to the hypothalamus, and is a single structure.
The pituitary gland is a single endocrine gland responsible for producing and regulating many hormones that control various bodily functions, including growth, metabolism, and reproduction. Other unpaired endocrine glands include the pineal gland, hypothalamus (neuroendocrine function), and pancreas (has endocrine and exocrine functions). Paired endocrine glands include the adrenal glands, testes (in males), and ovaries (in females).
The thyroid gland and parathyroid glands are also considered endocrine glands. The thyroid gland is typically a single, bilobed structure, but functionally it can be seen as a single unit. The parathyroid glands are typically four small glands, usually found in pairs on the back of the thyroid.