Regarding monozygotic twins, which of the following is not true?: (A) USG is more useful in the first half of pregnancy, (B) Sex discordance can occur rarely, (C) Always monochoriomc, (D) More common following ovulation induction
Answer is C. Ans: C (Always monochorionic) Ref: DC Du f fa's Textbook of Obstetrics, 7th edn, Pg 201Explanation:Monozygotic twins are always identical in sex.Monozygotic twins can be:Diamniotic dichorionicDiamniotic monochorionicMonoamniotic monochorionicConjoint twinsMost common cause of multiple pregnanciesovulation inductionUltrasound in the first half of pregnancy is best to check for amnionitis and chorionicity.