以下这句是定语从句吗?

题目

以下这句是定语从句吗?
My doctor says that too many cookies are bad for my health.哪个是先行词?从句是哪部份?

答案

这不是定语从句,而是宾语从句.My doctor says（主句） that 引导词too many cookies are bad for my health（作SAY的宾语)