The correct answer is thirst.
Baroreceptors are specialized neurons located within the walls of our blood vessels and are responsible for monitoring any changes in our blood pressure. If any change in our blood pressure is detected, then the baroreceptors send signals to the medulla oblongata to regulate the blood pressure. When an animal loses a lot of blood, then it could be suffering from hypovolemia, which is the term referring to the dangerous decrease in blood volume. This could cause an intense sense of thirst.