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: Medicine
[{'content': 'The CSF in patient with multiple sclerosis will typically exhibit \nSelect and explain. \nA. Glucose content of less than 20% of the serum content, B. Persistently elevated total protein content, C. Elevated immunoglobulin content, D. WBCs more than 100 cells /microliter', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Immunoglobulins typically K light chains are persistently elevated in multiple sclerosis', 'role': 'assistant'}]