Gynaecology & Obstetrics Mechanism of action of oral contraceptives containing ethinyl oestradiol and a progesterone is : A Inhibiting ovulation B Inhibiting the implantation C Thickening of cervical mucus D None of the above 💡 Explanation Mechanism of action of oral contraceptives containing ethinyl oestradiol and a progesterone is : ✓ Correct Answer: A. Inhibiting ovulation