下列各项，不属汗法治疗范畴的是（）

A.再造散

B.杏苏散

C.败毒散

D.升麻葛根汤

E.普济消毒饮

Which one of the following bonds has the shortest duration（）

A. Zero-coupon, 10-year maturity.

B. Zero-coupon, 13-year maturity.

C. 8% coupon, 10-year maturity.