<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 26-year-old woman, gravida 2, para 1, at 26 weeks gestation, comes to the emergency department because of pain and swelling in her right calf. Physical examination shows an increased circumference of the right calf. The leg is warm and tender on palpation. Dorsiflexion of the right foot elicits calf pain. An ultrasound of the right leg shows a noncompressible popliteal vein. Which of the following is the most appropriate pharmacotherapy for this patients condition?? A: Aspirin, B: Clopidogrel, C: Heparin, D: Rivaroxaban, E: Warfarin,  <response>: This is a question about deep vein thrombosis DVT in pregnancy. The patient is presenting with classic signs and symptoms of DVT - pain, swelling, warmth, and tenderness in the calf, along with ultrasound confirmation of a DVT. The most appropriate initial pharmacotherapy for DVT in pregnancy is heparin choice C. Heparin does not cross the placenta, and is the preferred anticoagulant for treatment of DVT in pregnancy. Aspirin and clopidogrel choices A and B are antiplatelet agents, not anticoagulants, and are not appropriate for DVT treatment. The novel oral anticoagulants rivaroxaban and apixaban choices D and E cross the placenta and their safety in pregnancy has not been established, so they should be avoided.C: Heparin 