This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ear, Subject name: ENT
[{'content': 'Peri lymph contains: \nSelect and explain. \nA. Na+, B. K+, C. Mg++, D. Cl-', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (Na+) (11-D) (205-Maqbool 1lth)Composition of Inner ear fluids EndolymphPerilymphCSF* Na+ (mEq/L)5140152* K+ (mEq/L)144104* Protein (mg/dL)126200-40020-50* Glucose10-248570* Perilymph - resembles ECF and is rich in Na low in K* Endolymph - resembles ICF and is rich in K* low in Na+', 'role': 'assistant'}]