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