—I heard someone screaming just now.

—Me too. _____ [ ]

A. What happened?

B. He's serious.    

C. It sounds nice.

D. What bout you?

男性，28岁，腰背及髋部疼痛一年，晨活动发僵，时而双眼红痛。查体：骶髂关节处叩痛，X线无异常，ESR28mm/h。为进一步确诊应查

A．血HLA-B27
B．IgM型RF
C．双膝关节X线片
D．血抗核抗体
E．PPD试验