Gynaecology & Obstetrics In case of Twining true statement is: A After embryonic disc fusion, conjoint twin is formed. B Incidence of monozygotic twin varies with race C Incidence of dizygotic twin is constant D The frequency of monozygosity and dizygosity is same. 💡 Explanation In case of Twining true statement is: ✓ Correct Answer: A. After embryonic disc fusion, conjoint twin is formed.