Heparin or LMW heparin is preferred for pregnant patients needing an anticoagulant because:
A. its molecular size does not allow it to cross the placenta to affect the offspring.
B. the offspring receives only a partial anticoagulant effect.
C. its molecular size allows it to cross the placenta and thus help the offspring.
D. the offspring receives the full anticoagulant effect.
Answer: A
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