This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
Heparin therapy is best monitored by which of the following given test? 
Select and explain. 
A. Prothombin time, B. Bleeding time, C. Activated Partial Thrombo plastin Time, D. International Normalised Ration
C: Activated Partial Thrombo plastin Time
Answer: C: Activated Partial Thrombo plastin Time 
Explanation: None