This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: ECG and Arrhythmias 1, Subject name: Medicine
Which of the following conditions will predispose to the following cardiac rhythm shown? 
Select and explain. 
A. Hypomagnesemia, B. Hyponatremia, C. Hypercalcemia, D. Hypothermia
A: Hypomagnesemia
Answer: A: Hypomagnesemia 
Explanation: -The ECG shows broad complex tachycardia with variable amplitude and is called as polymorphic VT. -Caused by hypomagnesemia and hypokalemia.