Which of the following is a mismatched pair?

(a) Adrenaline: pituitary gland.

(b) Estrogen: ovary.

(c) Pancreas: insulin.

(d) Progesterone: ovary.

The correct option is: A

Explanation of the correct option:

Adrenaline is secreted by the adrenal glands which are located on top of the kidneys.

The pituitary secretes many hormones like Melanocyte-Stimulating Hormone (MSH), Oxytocin, Growth hormone (GH), Thyroid Stimulating Hormone (TSH), Antidiuretic Hormone (ADH), Adrenocorticotropic Hormone (ACTH), Prolactin (PRL), Luteinising Hormone (LH), and Follicle-Stimulating Hormone (FSH)

Explanation of the incorrect option:

Option B: The two main classes of hormones secreted by the ovaries are estrogen and progesterone. These are steroid hormones. Estrogen is secreted by growing follicles and progesterone is secreted by the corpus luteum. Estrogen regulates the development of growing follicles and secondary sexual characteristics.

Option C: The endocrine part of the pancreas comprises Islets of Langerhans that release insulin and glucagon directly into the bloodstream. They help in regulating the blood sugar levels of the body.

Option D: The two main classes of hormones secreted by the ovaries are estrogen and progesterone. These are steroid hormones. Estrogen is secreted by growing follicles and progesterone is secreted by the corpus luteum. Estrogen regulates the development of growing follicles and secondary sexual characteristics.

Final answer: Adrenaline: pituitary gland is a mismatched pair.