This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Pharmacology
Longest acting insulin is 
Select and explain. 
A. Global zinc suspension, B. Insulin- zinc suspension, C. Neutral protamine hagedorm (NPH), D. Protamine- zinc insulin
D: Protamine- zinc insulin
Answer: D: Protamine- zinc insulin 
Explanation: (Protamine zinc insulin) (259-KDT 6th)Types of Insulin Preparations and Insulin analogues1. Rapid acting- Insulin lispro, Insulin aspart, Insulin glulisine2. Short acting- Regular (soluble) insuline3. Intermediate acting- Insulin zinc suspension or Lente, Neutral protamine hagedorm (NPH) or Isophane insulin4. Long acting- Protamine zinc insulin (PZI), Insulin glargine