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 rapidly acting insulin? 
Select and explain. 
A. Lente, B. Glargine, C. Ultralente, D. Lispro
D: Lispro
Answer: D: Lispro 
Explanation: Ans. D. LisproLispro and as part is rapid acting, regular insulin is short acting, Lente is intermediate acting and Ultra Lente, glargine is longer acting.