/usr/lib/mono/4.5/xbuild.rsp is in mono-xbuild 4.6.2.7+dfsg-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | # xbuild command line options specified here will be used
# by xbuild on every build, unless /noautoresponse is passed
# on the command line.
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