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: Physiology
What is the effect of sodium fluoride on Oxygen dissociation curve 
Select and explain. 
A. Right shift, B. Left shift, C. No effect on curve, D. Initial right and then left shift
C: No effect on curve
Answer: C: No effect on curve 
Explanation: Sodium fluoride totally arrests glycolysis by inhibiting enzymes so, glucose in neither used for anaerobic glycolysis or Rappaport Leubering Cycle. So, NaF have no effect on Oxygen dissociation Curve by affecting the level of 2, 3 - BPG.