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
[{'content': 'Which of the following conditions will predispose to the following cardiac rhythm shown? \nSelect and explain. \nA. Hypomagnesemia, B. Hyponatremia, C. Hypercalcemia, D. Hypothermia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: -The ECG shows broad complex tachycardia with variable amplitude and is called as polymorphic VT. -Caused by hypomagnesemia and hypokalemia.', 'role': 'assistant'}]