A 2-year-old man presents to the ER with burning substernal pain. He took several tablets of antacid at home prior to presentation without any relief. His heart rate is 90/min and blood pressure is 160/90 mmHg. ECG shows ST segment depression in lead II, III, and avf. As part of his treatment, enoxaparin therapy is initiated. This drug is expected to bind to which of following substances in this patients’ blood?
A. Fibrin
B. Antithrombin III
C. Plasminogen
D. Prothrombin
E. Protein C