诊断骨质疏松症的黄金指标为（）。

A.周身骨痛

B.下肢肌肉痉挛

C.X线检查出现骨变形

D.骨质密度低于诊断标准

E.血钙低于正常

George Orwell, ______ was Eric Arthur, wrote many political novels and essays. [ ]

A. the real name

B. what his real name

C. his real name

D. whose real name