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
Hea block is seen in - 
Select and explain. 
A. Hypermagensemia, B. Hypomagnesemia, C. Hypernatremia, D. Hypocalcemia
A: Hypermagensemia
Answer: A: Hypermagensemia 
Explanation: Answer- A. HypermagensemiaHypermagnesemia slows the hea and leads to hea block.