This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
[{'content': 'All are seen more in ECF except \nSelect and explain. \nA. Na+, B. Cl-, C. Mg++, D. HCO-3', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Na+,Ca+,Cl- and HCO3- are largely extracellular whereas K+,Mg2+ are predominantly seen in ICF.(Ref: Textbook of physiology AK Jain 5tg edition page no.27)', 'role': 'assistant'}]