Which is different from the others?[ ]

A.Asia.

B.Europe.

C.Japan.

狗脊的特征是

A．蚌壳蕨科植物的根茎

B．药材呈不规则盼长块状

C．表面深棕色，被光亮的金黄色茸毛

D．根茎含绵马酚，毛茸含鞣质

E．双韧管状中柱