This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Twin Pregnancy, Molar Pregnancy, Gestational Trophoblastic disease and contraception in special situations (Sour Grapes!), Subject name: Gynaecology & Obstetrics
Most common twins after assisted reproduction: 
Select and explain. 
A. Monozygotic, B. Acardiac twin, C. Dizygotic twin, D. Conjoined twin
C: Dizygotic twin
Answer: C: Dizygotic twin 
Explanation: Most common twins after assisted reproduction are dizygotic twins. For increasing the success of IVF and the expenses involved, it's a norm to transfer 2-3 embryos of day 3 or 1-2 embryos of Day 5. For women lesser than 35 years, the implantation rate is better and hence these are the ones who have more multiple pregnancies.