This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Pharmacology
Which of the following is not contraindicated for use of digitalis 
Select and explain. 
A. Acute rheumatic carditis, B. Thyrotoxicosis, C. WPW syndrome, D. Hyperkalemia
D: Hyperkalemia
Answer: D: Hyperkalemia 
Explanation: Hyperkalemia, also spelled hyperkalaemia, is an elevated level of potassium (K+) in the blood serum. Normal potassium levels are between 3.5 and 5.0 mmol/L (3.5 and 5.0 mEq/L) with levels above 5.5 mmol/L defined as hyperkalemia. Typically this results in no symptoms. Occasionally when severe it results in palpitations, muscle pain, muscle weakness, or numbness. An abnormal hea rate can occur which can result in cardiac arrest and death. Refer kDT 6/e p499