Task: Instance Description Understanding (ontology: Sciences/Biology)

Which of the following definitions best describes the instance 'freemartin'?

A. An annual event in the first half of May meant to inspire awareness of genital autonomy.
B. A pseudoscientific and transphobic belief which postulates and perpetuates the idea that many (or all) cases of gender dysphoria (or "transness" generally) are the result of a transgender "social contagion". Generally, it is meant to imply that dysphoria appears "spontaneously" in adolescents and young adults.
C. An infertile female mammal with masculinized behavior and non-functioning ovaries. Genetically the animal is chimeric: karyotyping of a sample of cells shows XX/XY chromosomes. The animal originates as a female (XX), but acquires the male (XY) component in utero by exchange of some cellular material from a male twin, via vascular connections between placentas: an example of microchimerism.
D. Rarely used term; often in poetic or literary contexts. Used variously to refer to women with masculine characteristics. Definitions include reference to women who are "scolding, domineering, or highly opinionated" and women who are "rough, loud, and aggressive."

Answer: An infertile female mammal with masculinized behavior and non-functioning ovaries. Genetically the animal is chimeric: karyotyping of a sample of cells shows XX/XY chromosomes. The animal originates as a female (XX), but acquires the male (XY) component in utero by exchange of some cellular material from a male twin, via vascular connections between placentas: an example of microchimerism.