This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fluid and electrolytes, Subject name: Medicine
[{'content': 'ECG of a patient with snake bite is shown below. What is the abnormality seen? \nSelect and explain. \nA. Hyperkalemia, B. Hypokalemia, C. Myocarditis, D. Bigemini', 'role': 'user'}, {'content': 'Answer: A \nExplanation: ECG changes typically occur when serum potassium is < 3 mEq/L, and include ST segment sagging, T wave depression, and U wave elevation. With marked hypokalemia, the T wave becomes progressively smaller and the U wave becomes increasingly larger . Ref Davidson 23rd edition pg 370', 'role': 'assistant'}]