Transgendered people's gender identity is defined in the same way as cisgendered people's: male, female, genderless, non-binary, bigender, trigender, neutrois etc.
Having a dropdown menu with Male/Female/Transgender is not a valid list of options! A better (yet still simplistic) option to acknowledge non-binary gender identities would be to have options as follows: Male/Female/Other/Prefer Not To Say.
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