This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory Infections, Subject name: Social & Preventive Medicine
[{'content': 'Dose of Tuberculin in Mantoux test is:- \nSelect and explain. \nA. 1 TU in 1 ml, B. 1 TU in 0.1 ml, C. 0.1 TU in 1 ml, D. 0.1 TU in 0.1 ml', 'role': 'user'}, {'content': 'Answer: B \nExplanation: TUBERCULIN TEST / MONTOUX TEST - Delayed / Type-IV hyper sensitivity reaction. Antigen used: purified protein Derivative Tuberculin: 50000 TU/mg Dose: I TU in 0.1 ml Into flexor aspect of fore arm After 3 days , measure induration < 5 mm- negative 5-10 mm - Equivocal > 10 mm- positive False Positive: Recent BCG vaccination Atypical mycobacteria infection False negative: HIV +ve ,Immunosupression Miliary TB Malignancy Peussis, measles, chicken pox. NOTE Prevalence of TB infectionis determined byTuberculin test. Prevalence of TB disease is determined by sputum smear examination', 'role': 'assistant'}]