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: Pharmacology
A patient diagnosed to have deep vein thrombosis is being treated with heparin. Which of the following test will you order to adjust its dosage ? 
Select and explain. 
A. Platelet count, B. Prothrombin time, C. Bleeding time, D. Activated paial thromboplastin time
D: Activated paial thromboplastin time
Answer: D: Activated paial thromboplastin time 
Explanation: Ans. is 'd' i.e., Activated paial thromboplastin time o Lab control of heprin is done by monitoring aPTT.