This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Physiology
Which of these is not a cause of rightward shifted to right in? 
Select and explain. 
A. Hyperkalemia, B. Hypokalemia, C. Anemia, D. Metabalic alkalosis
B: Hypokalemia
Answer: B: Hypokalemia 
Explanation: A decrease in the pH shifts the curve to the right, while an increase in pH shifts the curve to the left. This occurs because a higher hydrogen ion concentration causes an alteration in amino acid residues that stabilises deoxyhaemoglobin in a state (the T state) that has a lower affinity for oxygen Ref: guyton and hall textbook of medical physiology 12 edition page number:348,349,350