>>40072245
It's impossible only if you fail to even try verifying it.

Genes associated with transsexuality:
https://academic.oup.com/jcem/article/104/2/390/5104458
https://www.psychiatria-danubina.com/UserDocsImages/pdf/dnb_vol35_noSuppl%202/dnb_vol35_noSuppl%202_179.pdf

Transsexuality Among Twins: Identity Concordance, Transition, Rearing, and Orientation
http://www.hawaii.edu/PCSS/biblio/articles/2010to2014/2013-transsexuality.html
https://www.hawaii.edu/PCSS/biblio/articles/2015to2019/2016-transsexualism.html

"All the genetic, postmortem, and in vivo scanning observations support the neurobiological theory about the origin of gender dysphoria … There is no evidence that one's postnatal social environment plays a crucial role in the development of gender identity or sexual orientation."
Handbook of Clinical Neurology (2021), Vol. 181, Chapter 31, p. 427–443.
https://linkinghub.elsevier.com/retrieve/pii/B9780128206836000312

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5738422/
>Our findings suggest that the neuroanatomical signature of transgenderism is related to brain areas processing the perception of self and body ownership
Sex is determined in the womb separately between the brain and genitalia, leading to this potential for a mismatch between the brain's sexed body-map and the sex characteristics outside the brain.
Some people call this "subconscious sex". Conventionally, a mismatch in "gender identity".

Also see the high rate of reported "phantom limb syndrome" in transsexuals, though not for a "limb".
https://en.wikipedia.org/wiki/Phantom_limb#Other_phantom_sensations
https://en.wikipedia.org/wiki/Supernumerary_phantom_limb