The correct option is B Norethindrone
Antifertility drugs are chemical substances which suppress the action of hormones that promote pregnancy.
Antifertility drug is novestrol (Ethylnylestradiol ).
The estrogen derivative which is used in combination with progesterone derivative is ethynylestradiol (novestrol).
Norethindrone is an example of synthetic progesterone derivative most widely used as antifertility drug.
Veronal and Equanil are tranquillizers.
Hence, option (a) and (b) are correct.