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: Medicine
Why is tetany seen with hyperventilation 
Select and explain. 
A. Metabolic alkalosis, B. Metabolic acidosis, C. Respiratory alkalosis, D. Respiratory acidosis
C: Respiratory alkalosis
Answer: C: Respiratory alkalosis 
Explanation: In hyperventilation patient develops hypocalcemia ,so he develops tetany. Tetany hyperventilation Low levels of carbon dioxide cause tetany by altering the albumin binding of calcium such that the ionized (physiologically influencing) fraction of calcium is reduced; one common reason for low carbon dioxide levels is hyperventilation. Low levels of magnesium can lead to tetany Ref Davidson 23rdedition pg 620