There are $$29$$ students in a certain class. $$12$$ of the students have a sister and $$18$$ of the students have a brother. In this class, only Tania, Barbara, and Anna do not have any siblings. How many students from this class have both a brother and a sister? 
选项为:A:$$$$None  B:$$1$$  C:$$3$$  D:$$4$$  E:$$6$$  请回答其中一个选项.