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': 'Percentage of Na+ in 0.9% of NaC1 - \nSelect and explain. \nA. 0.45%, B. 1.54, C. 0.90%, D. 2.84%', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., O.45%Normal saline (isotonic saline)This question is straightforward you can solve it even if you do not know the composition of 0.9% of NaCl 0.9 % NaCl is isotonic saline.0..9%NaCl means 9.0 gm of salt (NaCl) in one litre (i.e.,0.9%) > Out of which Na- is half (0.45%) and Cl is half (0.045)", 'role': 'assistant'}]