Sorry if this is a silly question, but would a biologist or doctor consider an FtM transsexual who is post-operative and on hormone therapy to be biologically male, or some form of intersex? They have the two X chromosomes and mostly female skeleton but for the most part they'd be morphologically male. Also, what about the reverse for MtF transsexuals?

(It gets confusing when someone asks a transitioned trans person what they are biologically.)

there is no correct or accepted answer and doctors struggle with this just like everyone else (which vary between societal norms). In this case the gender determined genetics, reproductive organs and external sexual characteristics are all different.