This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastro-Intestinal Tract, Subject name: Pharmacology
[{'content': 'The concentration of sodium ions in the standard WHO oral rehydration Solution is: \nSelect and explain. \nA. 40 m moles/L, B. 60 m moles/L, C. 90 m moles/L, D. 110 m moles/L', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Concentration of Na+ is 90 mmol/L in standard WHO-ORS whereas it is 75 mmol/L in New formula ORS. NEW FORMULA ORS contains :- Na+ - 75 mM k+ - 20mM Cl- - 65mM Glucose - 75mM Citrate - 10mM Total - 245mOsm/L', 'role': 'assistant'}]