This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Multiple Pregnancy, Subject name: Gynaecology & Obstetrics
Exclusive complication of monochorionic twins- 
Select and explain. 
A. Cord entanglement, B. Twin to twin transfusion, C. Discordant growth, D. Abortion
B: Twin to twin transfusion
Answer: B: Twin to twin transfusion 
Explanation: Ans. is 'b' i.e., Twin to twin transfusion Complications of mcinochor ionic twinsTwin to twin transfusion:-o It is a clinicopathological state, exclusively occurring in monozygotic twins, where one twin appears to bleed into other through placental vascular anastomosis. As a result receptor twin becomes larger with hvdramnios, polycythemic, hypertensive and hypervolemic at expense of donor twin who becomes smaller with oligohydramnios, anaemic, hypotensive and hypovolemic.Dead fetus syndrome:-o Death of one twin is associated with poor outcome of the co-twin.Twin reversed arterial perfusion (TRAP) :-o Characterized by acardiac perfused twin having blood from co-twin via large arterial to arterial or vein to vein anastomosis. In majority co-twin dies (in perinatal period) due to high output cardiac failure.MonoamniocityConjoined twins