John is very ____-if he promises to do something he'll do it. [ ]

A. independent

B. confident

C. reliable

D. flexible

原发性醛固酮增多症最主要的实验室检查为（）

A.低血钾

B.低钾性碱中毒

C.低血钾状态下高尿钾

D.碱性尿

E.血浆肾素-血管紧张素活性降低