This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Fluid & Electrolyte), Subject name: Surgery
[{'content': "The highest concentration of potassium is in: \nSelect and explain. \nA. Plasma, B. Isotonic saline, C. Ringer lactate, D. Darrow's solution", 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. (d) Darrow's solutionHighest potassium concentration is seen in Darrow solution. Composition Na+K+Cl-Ca++LactateGlucoseCaloriesIV fluid 5.41121.827--Ringer'slactate(Hartmann's)130-154----Normal saline (0.9% NaCl)154-154----10% glucose-----1004000.45 NaCl/5% glucose77-77--50200Darrow'ssolution12135103-53--", 'role': 'assistant'}]