system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Which of the following anticoagulant is safest in pregnancy?
assistant
The correct answer is  Oral anticoagulants like warfarin, phenindione and dicumarol can cross placenta and produce teratogenicity if used during pregnancy. Heparin does not cross placenta and is safe in pregnancy.