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: Surgery
The highest concentration of potassium is in - 
Select and explain. 
A. Plasma, B. Isotonic saline, C. Ringer lactate, D. Darrow's solution
D: Darrow's solution
Answer: D: Darrow's solution 
Explanation: Ans. is 'd' i.e., Darrow's solution