The correct answer is option 4: Insulin. Insulin is a hormone that regulates the amount of glucose in the blood. It is produced by the pancreas and plays a crucial role in the body`s metabolism of carbohydrates.
Option 1: Glucogen is not a hormone, but rather a stored form of glucose in the body.
Option 2: Thyroxine is a hormone produced by the thyroid gland, but its primary role is in regulating the body`s metabolism, not glucose levels.
Option 3: Oxytocin is a hormone involved in stimulating contractions during childbirth and promoting bonding, and it does not play a significant role in regulating glucose levels.
It is important to note that the correct answer to the question may be subject to scientific advancements or situational context, and the explanation provided is based on current knowledge.