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: Medicine
Which of the following is long acting insulin? 
Select and explain. 
A. Insulin Lispro, B. Insulin Aspart, C. Insulin Glargine, D. Insulin Glulisine
C: Insulin Glargine
Answer: C: Insulin Glargine 
Explanation: None