【单选题】
古印度社会有一套严格的等级制度span style=font-family: 宋体, SimSun;,/span高高在上的是span style=font-family: 宋体, SimSun;“/span婆罗门span style=font-family: 宋体, SimSun;”/spanspan style=font-family: 宋体, SimSun;“/span刹帝利span style=font-family: 宋体, SimSun;”,/spanspan style=font-family: 宋体, SimSun;“/spanspan style=font-family: 宋体, SimSun;”/spanspan style=font-family: 宋体, SimSun;“/span首陀罗span style=font-family: 宋体, SimSun;”/span社会地位低下span style=font-family: 宋体, SimSun;,/span这种制度被称为( )。