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
The separation of normally situated placenta in a case of multiple pregnancy may be due to the following except : 
Select and explain. 
A. Increased incidence of toxaemia, B. Sudden escape of liquor following rupture of membranes, C. Deficiency of vitamin B12, D. Deficiency of folic acid
D: Deficiency of folic acid
Answer: D: Deficiency of folic acid 
Explanation: Deficiency of folic acid