This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Blood Physiology, Subject name: Physiology
Which of the following would best explain a prolonged bleeding time test? 
Select and explain. 
A. Hemophilia A, B. Hemophilia B, C. Thrombocytopenia, D. Coumadin use
C: Thrombocytopenia
Answer: C: Thrombocytopenia 
Explanation: Three major tests are used to determine coagulation defects. PT(Prothrombin time)- is used to test the extrinsic pathway aPTT(Activated Paial Thromboplastin Time)-is used to test the intrinsic pathway BT(Bleeding time)- after a small cut is used to test for several clotting factors but is especially prolonged by a lack of platelets (Thrombocytopenia).