The correct answer is option 1: Adrenaline. Adrenaline is often referred to as the "Emergency Hormone" because it is released by the adrenal glands in response to stress or danger. When we encounter a threatening or challenging situation, adrenaline is quickly released into the bloodstream to prepare our body for a fight or flight response. It increases heart rate, boosts energy levels, dilates airways, and enhances blood flow to the muscles, all of which are crucial for a rapid response to emergency situations.

Option 2, Thyroxine, is a hormone produced by the thyroid gland that regulates metabolism and growth. While it is important for overall health and wellbeing, it is not specifically known as the "Emergency Hormone."

Option 3, Vasopressin, is a hormone that helps regulate water balance in the body by increasing water reabsorption in the kidneys. It is not commonly referred to as the "Emergency Hormone."

Option 4, Insulin, is a hormone produced by the pancreas that helps regulate blood sugar levels. It plays a crucial role in glucose metabolism but is not considered the "Emergency Hormone."