Depends on the reason you need to request gender, but for in-app pronoun purposes, I'd do:

  [ ] male
  [ ] female
  [ ] non-binary
  [text box for other]

And use "they" pronouns for the last two options.

(Ideally you'd allow the user to specify the pronouns themselves, but even among people who use non-conventional pronouns, getting them to correctly enter the subject/object/possessive cases of their choice is heavily hit or miss)