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: Pediatrics
Rapid antigen test for meningitis organisms in a child can be done on the following specimens EXCEPT– 
Select and explain. 
A. Blood, B. CSF, C. Urine, D. Throat swab
D: Throat swab
Answer: D: Throat swab 
Explanation: All books have mentioned CSF as a specimen for the detection of antigen.
No book has mentioned urine or blood.
But, amongst the given options, best answer is throat swab because other three are body fluids in which antigens can be detected.