【名词&注释】
感染率(infection rate)、死亡率(mortality)、发病率、川楝子(chinaberry fruit)、少年儿童(juvenile and children)、脾肾阳虚(yang deficiency of spleen and kidney)、儿童健康状况(children ' s health status)、密切相关(closely related)、肾阳虚衰(deficiency of the kidney-yang)、适用于(suitable for)
[单选题]与泄泻发病密切相关(closely related)的内因为( )
A. 肾阳虚衰(deficiency of the kidney-yang)
B. 脾胃虚弱
C. 肝脾不和
D. 脾肾阳虚
E. 心肾不交