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 an intermediate acting insulin? 
Select and explain. 
A. Insulin lispro, B. Regular insuin, C. NPH insulin, D. Insulin glargine
C: NPH insulin
Answer: C: NPH insulin 
Explanation: Ans. is 'c' i.e., NPH insulin