This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Infectious disease, Subject name: Pediatrics
Which of the following has no role in diagnosis Of childhood TB? 
Select and explain. 
A. ELISA, B. Mantoux, C. CXR, D. FNAC
A: ELISA
Answer: A: ELISA 
Explanation: Antibody detection by ELISA or other methods is of no utility in diagnosis of childhood tuberculosis.Mantoux test is a useful diagnostic aid. An induration of more than 10 mm is suggestive of natural infection.Glands,liver and other tissues may be examined for histological evidence of TB by FNAC. Chest X-ray upright PA view is usually sufficient. Reference: Ghai essential pediatrics 6th edition.