The correct answer is option 4, Adrenal. The adrenal glands are responsible for secreting hormones such as adrenaline and cortisol, which play a crucial role in regulating blood pressure. Adrenaline, also known as epinephrine, causes blood vessels to constrict, leading to an increase in blood pressure. Cortisol helps regulate blood pressure by controlling the balance of salt and water in the body. It is important to note that the liver, testis, and pancreas do not directly impact blood pressure. The liver is involved in filtering blood and producing important proteins, the testis is responsible for producing sperm, and the pancreas plays a role in digestion and insulin production. Therefore, option 4, Adrenal, is the correct correlation with blood pressure.