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
[{'content': 'Which of the following has no role in diagnosis Of childhood TB? \nSelect and explain. \nA. ELISA, B. Mantoux, C. CXR, D. FNAC', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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.', 'role': 'assistant'}]