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
True about hyperkalemia -a) Stop heart in systoleb) Insulin-Glucose is givenc) Serum potassium more than 5.2 mmol/Ld) ECG changes correlates with serum potassium 
Select and explain. 
A. c, B. d, C. bc, D. ac
C: bc
Answer: C: bc 
Explanation: None