Fluoride which is used in the collection of blood samples for glucose estimation inhibits whch of the following enzyme?

For blood glucose estimation in the laboratory, fluoride is added to the blood to prevent glycolysis by cells by inhibiting enzyme enolase so that blood glucose is correctly estimated. Ref: Harper's Principles of Internal Medicine, 26th Edition, Page 137; Textbook of Biochemistry By Vasudevan, 5th Edition, Pages 58, 87