bibtex-no-opt-remove-re

bibtex-no-opt-remove-re is a variable defined in `bibtex.el'.
Its value is

"\\`option"

Documentation:
If a field name matches this regexp, the prefix OPT is not removed.
If nil prefix OPT is always removed

You can customize this variable.

This variable was introduced, or its default value was changed, in version 24.1 of Emacs.