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
Which of the following is an intermediate-acting insulin 
Select and explain. 
A. Lispro, B. Regular insulin, C. NPH insulin, D. Glargine
C: NPH insulin
Answer: C: NPH insulin 
Explanation: NPH and protamine insulin are intermediate-acting insulins REF KD Tripathi 8th ed.