Match the following glands with their respective functions by filling in the blank with the letter of the function.

Functions

A. Control and balance levels of calcium and phosphate in blood and tissue fluids
B. Secretes androgen hormones, including testosterone and estrogen
C. Involved in regulating the body's sugar levels
D. Regulates the sleep-wake cycle
E. Secretes chemicals that dramatically alter energy levels
F. Produces hormones that control the rate at which cells burn fuels from food
Pineal

Gland: D

Parathyroid Gland: A
Testes: B
Pancreas: C
Thyroid Gland: F
Adrenal Gland: E

In order to match the provided functions with their respective glands, let's go through each option one by one:

A. Control and balance levels of calcium and phosphate in blood and tissue fluids: This function is associated with the parathyroid gland.

B. Secretes androgen hormones, including testosterone and estrogen: This function is primarily carried out by the gonads, which include the testes in males and ovaries in females.

C. Involved in regulating the body's sugar levels: This function is associated with the pancreas.

D. Regulates the sleep-wake cycle: The pineal gland, also known as the gland responsible for producing melatonin, is responsible for regulating the sleep-wake cycle.

E. Secretes chemicals that dramatically alter energy levels: This function is associated with the adrenal gland, which releases hormones like adrenaline and cortisol that affect energy levels.

F. Produces hormones that control the rate at which cells burn fuels from food: This function is primarily carried out by the thyroid gland.

Therefore, based on the functions provided, the gland that matches with each function is:
A. Parathyroid gland
B. Gonads (testes in males, ovaries in females)
C. Pancreas
D. Pineal gland
E. Adrenal gland
F. Thyroid gland

D