This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pathology
Which is the best parameter to monitor LMWH? 
Select and explain. 
A. aPTT, B. PT, C. INR, D. An Xa level
D: An Xa level
Answer: D: An Xa level 
Explanation: LMWH does not need any monitoring except in some special circumstances like pregnancy and old age and kidney disease. And Xa level is best parameter for its monitoring.