Longest acting insulin: (A) Degludec, (B) Aspa, (C) Regular insulin, (D) Glargine insulin
Answer is A. Degludec is the longest acting insulin.it acts for 42hrs so it can be given even once every alternate day. Other long-acting which acts for 24 hrs is glargine, detemir. They are insulin analogues. Ref: KD Tripathi 8th ed.