This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Blood transfusion, Subject name: Pathology
Which of the following tubes contain Sodium fluoride as anticoagulant? 
Select and explain. 
A. <img style="max-width: 100%" src=" />, B. <img style="max-width: 100%" src=" />, C. <img style="max-width: 100%" src=" />, D. <img style="max-width: 100%" src=" />
C: <img style="max-width: 100%" src=" />
Answer: C: <img style="max-width: 100%" src=" /> 
Explanation: This tube has sodium citrate .Ratio of chemical to blood is 1:9 This tube has heparin This tube contains EDTA This tube has potassium oxalate and sodium fluoride Sodium fluoride inhibits glycolysis and this tube is used for glucose estimation