This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fluid & Electrolyte, Subject name: Medicine
[{'content': 'Which ion channel is affected in hypokalemic periodic paralysis? \nSelect and explain. \nA. K+, B. Na+, C. Cl-, D. Ca2+', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. (d) Ca2+Ref : Harrison's Internal medicine 18/e, chapter 387, table 387-10", 'role': 'assistant'}]