Which of the following is not used in the preparation of oral contraceptive pills?

Oxytocin is a hormone involved in uterine contractions and milk ejection. It is not a component of oral contraceptive pills.

Oral contraceptive pills typically contain synthetic oestrogen and/or progesterone (progestogens). Ormeloxifene is a selective oestrogen receptor modulator (SERM) with contraceptive properties, but it used in the preparation of Saheli, the nonsteroidal contraceptive pill.