—Could you please tell me _____?

—Oh, Xiangyang, a beautiful ancient city in the northwest of Hubei Province.[ ]

A. where are you from                  

B. where you are from

C. you are from where                  

D. are you from where

女性，32岁，活动后胸痛1年。血红蛋白200g/L，血细胞比容63%，脾不大。以下诊断方法对诊断最不重要的是（）

A.红细胞寿命测定

B.血气分析

C.骨髓穿刺及骨髓活检

D.肝、脾、肾脏B超

E.心脏听诊