This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous QBank, Subject name: Medicine
[{'content': 'All of the following are true regarding CSF abnormalities in multiple sclerosis except? \nSelect and explain. \nA. CSF protein concentration is more than 100 mg/dl, B. CSF IgG index express ratio of IgG to albumin in CSF divided by the same ration in serum, C. Oligoclonal bands may be absent at onset of multiple sclerosis, D. Number of oligoclonal bands increase with time', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The following CSF parameters point against a diagnosis of multiple sclerosis: Pleocytosis of more than 75 cells/ml. Presence of polymorphonuclear lymphocytes. Protein concentration is elevated upto 100 mg/dl. IgG index (a comparison between IgG levels in theCSFand in the serum) is elevated in manyMSpatients', 'role': 'assistant'}]