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: Anaesthesia
All except one is continued prior to elective caesarean section in an hypertensive diabetic term gestation, obese female who is a case of chronic aorto iliac obstruction. 
Select and explain. 
A. Labetalol, B. Statins, C. Magnesium sulphate, D. Heparin
D: Heparin
Answer: D: Heparin 
Explanation: Heparin is stopped 6 hours priorly. Rest all drugs need to be continued till day of surgery.