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
All of the following are the electrocardiographic features of severe hyperkalemia except - 
Select and explain. 
A. Peaked T waves, B. Presence of U waves, C. Sine waves pattern, D. Loss of P waves
B: Presence of U waves
Answer: B: Presence of U waves 
Explanation: None