This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
[{'content': 'True about Mantoux test - \nSelect and explain. \nA. <5 cm always +ve, B. Usually -ve after treatment, C. Positive reacion in children <2 yrs is not impoant than adult, D. Usually read after 48-72 hours', 'role': 'user'}, {'content': 'Answer: D \nExplanation: <p> The result of tuberculin test is read after 48-96 hours but 72 hours (3rd day) is the ideal. Tuberculin reaction consists of erythema and induration.reaction exceeding 10 mm are considered &;positive&;. Park&;s textbook of preventive and social medicine,K.Park,23rd edition,page no:185 <\\p>', 'role': 'assistant'}]