This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
Knots in umbilical cord 
Select and explain. 
A. Caused by fetal movement, B. Very high risk of still birth, C. Dangerous in Diamniotic twins, D. Always indication for C-section
A: Caused by fetal movement
Answer: A: Caused by fetal movement 
Explanation: Knots in umbilical cord are caused by fetal movements.
Common in monoamniotic twins (dangerous). C-section is not indicated always.