This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fluids and Electrolyte Imbalance, Subject name: Medicine
All are features of hypermagnesemia except? 
Select and explain. 
A. Hypotension, B. Ileus, C. Tetany, D. Decreased DTR
C: Tetany
Answer: C: Tetany 
Explanation: Hypermagnesemia leads to inhibition of PTH release as well as inhibits calcium absorption from calcium sensitive receptor The resultant calcium depletion leads to vasodilation and neuromuscular blockade. The vasodilatation explains the hypotension and neuromuscular blockade explains ileus and decreased DTR.