This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
Which is a long acting insulin? 
Select and explain. 
A. Lispro, B. Aspa, C. Glargine, D. Glulicine
C: Glargine
Answer: C: Glargine 
Explanation: Ans. is 'c' i.e., Glargine