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: Biochemistry
. Anticoagulant used to estimate glucose from a sample sent from PHC is: 
Select and explain. 
A. EDTA, B. Calcium oxalate, C. Potassium oxalate + NaF, D. Sodium citrate
C: Potassium oxalate + NaF
Answer: C: Potassium oxalate + NaF 
Explanation: C i.e. Potassium oxalate + NaF