选C.
如果选WHAT WHERE,WHAT WHERE会在从句（KNOW的宾语从句）里面里充当成分.
比如I want to know what it is.看从句what it is,其实what 在这里充当了it is的表语,指IT IS WHAT的这个东西.It is（an apple.）
I want to know where Beijing is,这里where指代在哪个地方,比如it is (in China).
而你的问题,there is a hospital成分完整.所以IF