Which of the following statements about the risks associated with investing in bonds is most accurate（）

A. Corporate debentures are not subject to prepayment risk.

B. Liquidity risk is not relevant if the portfolio manager intends to hold the bond to maturity.

C. All fixed income securities except short-term Treasury bills are subject to volatility risk to some degree.

诊断急性胆囊炎时，需排除下列哪项疾病

A．急性阑尾炎

B．急性胃肠炎

C．急性胰腺炎

D．急性肾炎

E．急性肝炎