Which of the following statements about oral anticoagulants is FALSE ?: (A) They interfere with an early step in the synthesis of clotting factors, (B) Irrespective of the dose administered, their anticoagulant effect has a latency of onset of 1-3 days, (C) Their dose is adjusted by repeated measurement of prothrombin time, (D) They are contraindicated during pregnancy
Answer is A. None