/usr/lib/ocaml/VERSION is in ocaml-base-nox 4.01.0-3ubuntu3.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | 4.01.0
# The version string is the first line of this file.
# It must be in the format described in stdlib/sys.mli
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