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: Ans. is 'd' i.e., Throat swab All books have mentioned CSF as a specimen for the detection of antigen. o No book has mentioned urine or blood. o But, amongst the given options, best answer is throat swab because other three are body fluids in which antigens can be detected.