依据《金匮要略》原文，中风，邪入于络（）

A.肌肤不仁

B.重不胜

C.不识人

D.舌即难言，口吐涎

Lisa Cox feels that the price of corn is going to rise in the future and wants to lock in a price using either a futures or forward contract. She is unfamiliar with the differences between the two instruments and asks her associate, Matt Kudrow, to explain the differences. Which of Kudrow’s comments is TRUE In futures markets, the role of the clearinghouse is to:()

A. prevent arbitrage and enforce federal regulations. 

B. act as guarantor to both sides of a futures trade. 

C. reduce transaction costs by making contract prices public.