A 6-Year-Old Boy Is Brought to the Emergency Department Due

A 6-year-old boy is brought to the emergency department due to bleeding after a dental extraction earlier this morning.  The patient's past medical history is significant for painful swelling of his knee joints after minor trauma.  Aspiration of the joints during several occasions yielded frank blood, and he was diagnosed with hemarthrosis.  He has no known allergies.  Currently, hemostasis in this patient most likely can be achieved by the administration of which of the following?

A) Factor XII
B) Fibrinogen
C) Protein C
D) Thrombin
E) Urokinase

Correct Answer:

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