To avoid the wrath of social justice warriors, you need to provide a list of 600+ different gender identities, and if you miss one you are now a racist. You then also need to provide the user with a list of pronouns, because saying "him" to someone who wants to be addressed as "madame" is a micro-aggression.

You should probably also put "trigger warning" before the gender part of your form, to avoid someone becoming uncomfortable.

Or...you know...skip the gender part of your form. It's not needed, for anything.