The dilemma a doctor often faces is whether he should tell thruth to the patient or not.这句话是同位语从句还是宾语从句?

The dilemma a doctor often faces is whether he should tell thruth to the patient or not.这句话是同位语从句还是宾语从句?
The dilemma a doctor often faces is whether he should tell thruth to the patient or not.这句话是同位语从句还是宾语从句?

The dilemma a doctor often faces is whether he should tell thruth to the patient or not.这句话是同位语从句还是宾语从句?
表语从句.主句部分是The dilemma is whether he should tell thruth to the patient or not.

不是同位语从句，也不是宾语从句，是定语从句和表语从句。
a doctor often faces 是修饰dilemma的定语从句，whether he should tell thruth to the patient or not是表语从句。

主语从句
The dilemma is whether he should tell thruth to the patient or not作为主句
dilemma是主语
a doctor often faces 做从句修饰，
同位语：http://baike.baidu.com/view/409810.htm

he dilemma [a doctor often faces]其中的[]是宾语从句， 词句省去了引导词that
区分同位语从句和宾语从句关键在于引导词是否在从句中充当句子成分，如果充当就是定语从句，否则为同位语从句； 另外同位语从句的引导词一般不能省。
The fact that he has done this many times is known to everyone....

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he dilemma [a doctor often faces]其中的[]是宾语从句， 词句省去了引导词that
区分同位语从句和宾语从句关键在于引导词是否在从句中充当句子成分，如果充当就是定语从句，否则为同位语从句； 另外同位语从句的引导词一般不能省。
The fact that he has done this many times is known to everyone. 此句that引导的是同位语从句。
The fact that they were all curious about is still unknown. 本句that引导的是宾语从句, that 作句中about的宾语

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定语从句，
1.the dilemma that a doctor often faces =there is dilemma. A doctor often faces this dilemma.
The dilemma （a doctor often faces） is whether he should tell thruth to the patient or not。<...

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定语从句，
1.the dilemma that a doctor often faces =there is dilemma. A doctor often faces this dilemma.
The dilemma （a doctor often faces） is whether he should tell thruth to the patient or not。
括号内从句修饰delemma意为，这个困境医生经常碰到，
原句翻译为：医生经常会遇到的进退两难是这样的，即是否应该将真实情况告诉患者
1.为何不是同位语从句
同位语从句要求从句内容=先行词
2.为何不是宾语从句
宾语从句出现在主句宾语位置，地位等于名词，此句明显不是

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都有

同位语从句，因为The dilemma 在a doctor often faces 这个从句中不充当任何成分，这就是区分同位语从句和宾语从句的最主要依据

这句话有两个从句，其中(that)a doctor often faces 是定语从句修饰the dilemma, whether 引导的从句放在is 的后边，是一个表语从句。