【名词&注释】
脾肾阳虚(yang deficiency of spleen and kidney)、密切相关(closely related)、肾阳虚衰(deficiency of the kidney-yang)
[单选题]与泄泻发病密切相关的内因为( )
A. 肾阳虚衰 B. 脾胃虚弱 C. 肝脾不和 D. 脾肾阳虚 E. 心肾不交