When computing the yield to maturity, the implicit reinvestment assumption is that the interest payments are reinvested at the:（）

A. prevailing yield to maturity at the time interest payments are received. 

B. yield to maturity at the time of the investment. 

C. current yield.

有关癫痫的叙述哪项是错误的（）

A.每位癫痫患者仅有一种发作类型

B.遗传因素和环境因素均可影响癫痫发作

C.部分女性癫痫患者在月经期发作频繁

D.根据病因，可将癫痫分为特发性、症状性和隐源性