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
The ECG in hyperkalemia classically shows: September 2009, 2010 
Select and explain. 
A. Increase QRS duration, B. Shoened PR interval, C. Prominent U waves, D. Increased R wave amplitude
A: Increase QRS duration
Answer: A: Increase QRS duration 
Explanation: Ans. A: Increase QRS duration