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: Pathology
Which of the following is the rationale to perform a spinal tap on a newly diagnosed client with leukemia? 
Select and explain. 
A. To rule out bacterial meningitis, B. To check if leukemia has spread to the cerebral spinal fluid, C. To classify the type of leukemia, D. To lower the pressure in the brain
B: To check if leukemia has spread to the cerebral spinal fluid
Answer: B: To check if leukemia has spread to the cerebral spinal fluid 
Explanation: B: A spinal tap can determine if leukemia has infiltrated to the cerebral spinal fluid (CSF).
A: A spinal tap can be done to rule out bacterial meningitis but this is not the reason for the test on a client with leukemia.
C&D: Spinal tap is not done to identify the classification of leukemia and to decrease intracranial pressure.