Article 15(1) of the Constitution of India states: "The State shall not discriminate against any citizen on grounds only of religion, race, caste, sex, place of birth or any of them." The question asks about discrimination against a "man or a woman," which directly relates to the ground of sex. While place of birth and religion (option d) are also prohibited grounds, 'sex' is the specific ground that pertains to discrimination based on being a man or a woman. Remuneration is not a prohibited ground under Article 15(1).