下面对鞍区、桥小脑角区MRI检查技术的叙述错误的是（）

A.查垂体微腺瘤，垂体腺瘤，桥小脑角占位，鞍区脑膜瘤

B.常规采用高分辨、薄层矢状、冠状扫描

C.必要时作横断位扫描

D.常需增强扫描

E.鉴别鞍区病变的出血或脂肪成分，需加做水抑制序列

I won't tell you ______ to do to work out the problem. You should try your best first. [ ]

A. how

B. when

C. what

D. where