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: Physiology
[{'content': 'An increase in external K+  concentration: \nSelect and explain. \nA. Decrease RMP, B. Increase RMP by  –10 mv for each 10 mEq/L increase in K+, C. No change, D. Increase RMP by –20 mv for each 10 meq/L increase in K+', 'role': 'user'}, {'content': 'Answer: A \nExplanation: With hyperkalemia,\xa0membrane\xa0voltage\xa0is depolarized\xa0gradually.\xa0Depolarization\xa0of\xa0membrane voltage means decrease in RMP. Remember,\xa0a\xa0decrease\xa0in\xa0the\xa0membrane potential (RMP) means that the voltage has moved closer to ground (0 mv) or become more positive.', 'role': 'assistant'}]