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': 'Tuberculin test is said to be positive when there is. \nSelect and explain. \nA. Induration, B. Erythema, C. Erythema, induration, D. Induration with blistering', 'role': 'user'}, {'content': 'Answer: A \nExplanation: - A positive tuberculin test is when an induration of diameter 10 mm more is present. - erythema is not taken into account. - It indicates hypersensitivity to tuberculoprotein, denoting infection with tubercle bacilli or BCG immunisation , recent or past with or without clinical disease. Reference : Anathanarayan & paniker&;s 9th edition, pg no: 354,355', 'role': 'assistant'}]