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: Anaesthesia
If you are asked to collect 4 serial samples from lumbar puncture. What should be done with first sample? 
Select and explain. 
A. Cell counts like differential counts, B. Biochemical tests [protein & glucose etc, C. Bacterial culture and gram staining, D. Mycobacterial & fungal culture and staining
A: Cell counts like differential counts
Answer: A: Cell counts like differential counts 
Explanation: Ans. is'a'i.e., Cell counts like differential countsRef: <a href=" classic approach is to send the 4 CSF tubes for the following studies:</strong>Tube I - Cell count and differentialTube 2 - Glucose and protein levelsTube 3 - Gram stain, culture and sensitivity (C&S)Tube 4 - Cell count and differential