题目内容
（请给出正确答案）
From introduction, what was the author studying？（)
A.This article will not attempt to replicate the above mentioned reviews but will summarize published clinical trials on bonded oxide ceramic restorations and correlate their results with that of laboratory bond strength testing using the same bonding methods as in the clinical trials.
B.The authors of this systematic review concluded, that promising laboratory test results still need to be confirmed by clinical studies before clinical recommendation could be given.
C.Clinical trials with resin-bonded restorations that had no or only limited mechanical retention and were made from alumina or zirconia ceramic were identified using an electronic search in PubMed database.
D.The purpose of this review is to present the best available clinical evidence for successful bonding of dental oxide ceramic restorations.
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