A 55-year-old female with a history of lung cancer, protein C deficiency, currently on hormone replacement therapy for post menopausal symptoms, presents with bilateral lower extremity swelling after a prolonged plane ride from Asia. She reports that the swelling decreases when she elevates her legs at night when she goes to sleep. Which of the following would indicate a decreased risk for thrombosis?
A. Her history of lung cancer
B. Her protein C deficiency
C. Prolong immobilization from a long trip
D. Reversible lower extremity swelling
E. Taking hormone replacement therapy
Answer: D