[WinterAyars]

There are a variety of conditions that usually fall into "intersex", from XY females (who usually identify as female and would typically pick the female option as that's how they typically (again: typically, they're perfectly justified in choosing "other" or "transgender" and arguably justified in choosing "male") prefer to describe themselves) to chimeras (who can be damn near anything) or the like. "Other" could also be someone who has modified their sex, but is not "transgender" or at least not comfortable self-describing that way (androgynes, certain lesbians, etc) or someone who does not fit into the binary gender scheme in general. (If we're talking gender.)

"Transgender" is pretty straightforward.