Which of the following drug was discovered through the observation of clinical side-effects?
A.
Indomethacin
B.
Diazepam
C.
Fexofenadine hydrochloride
D.
sildenafil citrate
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【单选题】一 What do you think the most impor t ant( 最重要的 )is in the library? - - _______,We must keep qui e t. prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace> A. sport B. rule C. game