患者，男，50岁，近年来腰臀部痛放射到左足跟处，MRI示有L、S椎间盘突出，查体可能发现的体征是（）

A.左提睾反射消失

B.左膝反射减弱或消失

C.左跟腱反射减弱或消失

D.左跖反射消失

E.左肛门反射消失

Which of the following statements regarding liquidity risk is FALSE（）

A. The bid-ask spread is one measurement of liquidity risk.

B. Emerging markets typically have more liquidity risk than established markets.

C. Liquidity risk is not important to an investor who intends to hold a security until maturity.