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
[{'content': 'Digitalis toxicity can cause: \nSelect and explain. \nA. Hyperkalemia, B. Nausea, C. Arrhythmias, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ref:KDT 6/e p498 Some early warning signs of overdose are confusion, loss of appetite, nausea, vomiting, diarrhea, or vision problems. Othersigns of overdose are changes in the rate or rhythm of the heabeat (becoming irregular or slow), palpitations (feeling of pounding in the chest), or fainting.', 'role': 'assistant'}]