This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Platelet, Subject name: Pathology
You are working in a PHC and have to send a sample for blood glucose estimation. Which of the following anticoagulant will you use for sending your sample? 
Select and explain. 
A. EDTA, B. Heparin, C. Potassium oxalate + sodium fluoride, D. Tri Sodium citrate
C: Potassium oxalate + sodium fluoride
Answer: C: Potassium oxalate + sodium fluoride 
Explanation: Blood samples for measurement of glucose are taken in Gray l containing Potassium oxalate + sodium fluoride. Enolase enzyme in the glycolysis is inhibited by fluoride so sample is collected in tubes containing fluoride to inhibit glycolysis.