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
Sine wave pattern on ECG is done when serum potassium exceeds mEq/dl? 
Select and explain. 
A. > 6 mEq/dl, B. > 7 mEq/dl, C. > 8 mEq/dl, D. > 10 mEq/dl
C: > 8 mEq/dl
Answer: C: > 8 mEq/dl 
Explanation: Answer- C. > 8 mEq/dlSine wave pattern- > 8 mEq/dl