The correct option is B insulin
First human hormone produced through genetic engineering of E. coli bacterium was insulin. Naturally, insulin hormone in human body is secreted by the pancreas that maintains the blood sugar level in our body by allowing to use sugar (glucose) from carbohydrates in the food that we eat for energy or allow them to store in the form of glycogen for future use. Thus insulin helps keep our blood sugar level from getting too high (a symptom of diabetes) or too low (hypoglycemia).