Gynaecology & Obstetrics Oral contraceptives prevent pregnancy by NE : A Inhibitation of ovulation by inhibiting release of LH B Preventing the nidation of the feilized ovum C Increasing the motily of the cilia in the tube and uterus D Alteration of the pH of the endometrium 💡 Explanation Oral contraceptives prevent pregnancy by NE : ✓ Correct Answer: A. Inhibitation of ovulation by inhibiting release of LH