Gynaecology & Obstetrics Conjugate of the diagonal is taken as ‘a’ cm, then obstetric conjugate will be A a + 1 cm B a + 2 cm C a - 1 cm D a - 2 cm 💡 Explanation Conjugate of the diagonal is taken as 'a' cm, then obstetric conjugate will be ✓ Correct Answer: D. a - 2 cm