关于浅层巩膜炎与巩膜（基质）炎，下述叙述错误的是（） A.两者的发病机制可能均与自身
题型：单项选择题
问题：
关于浅层巩膜炎与巩膜（基质）炎，下述叙述错误的是（）
A.两者的发病机制可能均与自身免疫反应有关
B.浅层巩膜炎的症状通常较轻，而巩膜（基质）炎的症状通常较重
C.浅层巩膜炎病变通常较局限，而巩膜（基质）炎病变可累及较大范围
D.两者用糖皮质激素和非甾体抗炎药物治疗均有效
E.两者均有自愈倾向
题型：单项选择题
For a group of n people, k of whom are of the same sex, the expression 
yields an index for a certain phenomenon in group dynamics for members of that sex. For a group that, consists of 20 people, 4 of whom are females, by how much does the index for the females exceed the index for the males in the group ？（）