This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S., Subject name: Medicine
[{'content': 'Miller Fischer test is used for: \nSelect and explain. \nA. Evaluating cognition in NPH., B. Severity of paralysis in GBS., C. Grading muscle involvement in ALS., D. Measuring disability in Multiple sclerosis.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A. Evaluating cognition in NPHEvaluating cognition in NPH. The CSF tap test, sometimes lumbar tap test or Miller Fisher Test, is a medical test that is used to decide whether shunting of cerebrospinal fluid (CSF) would be helpful in a patient with suspected normal pressure hydrocephalus (NPH).The test involves removing 30mL of cerebrospinal fluid (CSF) through a lumbar puncture, after which cognitive function is clinically reassessed. Clinical improvement showed a high predictive value for subsequent success with shunting.', 'role': 'assistant'}]