This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Medicine
Which of the following drugs can be safely prescribed in pregnancy - 
Select and explain. 
A. Warfarin, B. ACE inhibitors, C. Heparin, D. Beta-blockers
C: Heparin
Answer: C: Heparin 
Explanation: For pregnant women and women who have given bih, heparin is the anticoagulant of choice and is recommended by the Royal College of Obstetricians and Gynaecologists. It does not cross the placenta, and therefore is considered to be safe . Ref - Harrisons 20e p848-850