The correct answer is option 4. Adrenaline is the hormone that regulates blood pressure and it is secreted by the adrenal glands.
Option 1 is not correct as insulin is a hormone that regulates blood sugar levels and is secreted by the pancreas, not blood pressure.
Option 2 is not correct as epinephrine, also known as adrenaline, is not secreted by the kidneys. Epinephrine is secreted by the adrenal glands, which are located on top of the kidneys.
Option 3 is not correct as thyroxin is a hormone that regulates metabolism and is secreted by the thyroid gland, not blood pressure.
Therefore, option 4 is the correct answer as adrenaline is the hormone that regulates blood pressure and it is secreted by the adrenal glands.