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
[{'content': 'The separation of normally situated placenta in a case of multiple pregnancy may be due to the following except : \nSelect and explain. \nA. Increased incidence of toxaemia, B. Sudden escape of liquor following rupture of membranes, C. Deficiency of vitamin B12, D. Deficiency of folic acid', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Deficiency of folic acid', 'role': 'assistant'}]