The correct option is B Insulin
Insulin is a protein hormone that is required by humans to maintain normal blood glucose levels in the body. In patients suffering from diabetes, insulin production is halted or is insufficient. To supplement this shortage, human insulin produced using genetically modified E. coli, is injected into the patient. Insulin is not naturally generated by the E. coli. However, the human insulin gene is introduced into the E. coli genome, thus enabling the bacterium to produce large amounts of insulin in large chemically controlled bioreactors.