Topic: Gender (লিঙ্গ),

Best Answer Explained in Below-:

The question asks for the opposite gender of "doctor." In traditional usage, the term "doctor" is gender-neutral and can refer to a medical professional of any gender. However, historical contexts have often created specific terms that denote gender differences in certain professions.

Option A, "Lady doctor," specifically refers to a female doctor and was commonly used in the past to differentiate female practitioners from their male counterparts. This designation highlights the gender of the doctor but does not imply an opposing role; rather, it acknowledges the doctor's gender.

Option B, "Doctress," is a less commonly used term that refers to a woman who practices medicine. Though it serves the purpose of indicating the female counterpart, it's not widely accepted or recognized in contemporary language.

Option C, "Nurse," denotes a different profession entirely and does not serve as an opposite gender term for "doctor."

Option D, "Doctors," simply pluralizes "doctor" and does not apply to the question of gender.

Thus, "Lady doctor" is the most suitable choice as it directly answers the query regarding the female counterpart of "doctor," making it the correct response.