Female, 30 years old. A mass was found in the right lower abdomen for 3 months. The operation showed that the right ovary was replaced by a cystic mass, which was filled with sebum, hair and teeth. The most likely diagnosis is ()
选项：

A:Mature teratoma;
B:Immature teratoma;
C:Endodermal sinus tumor;
D:Cystadenoma;
E:Dysgerminoma