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: Medicine
Tetany may be a feature of the following except - 
Select and explain. 
A. Hyperventilation, B. Hypokalaemic alkalosis, C. Hypomagnesaemia, D. Hyponatraemia
D: Hyponatraemia
Answer: D: Hyponatraemia 
Explanation: None