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': 'Tuberculin positive means? \nSelect and explain. \nA. Immunodeficient patient, B. Resistance to tuberculin protein, C. Patient is infected with mycobacterium, D. Patient is suffering from disease', 'role': 'user'}, {'content': 'Answer: C \nExplanation: A positive reaction to tuberculin test is generally accepted as evidence of past or present infection by M.tuberculosis. Reference; Park&;s Textbook of preventive and social medicine, 24th edition.Pg no. 195', 'role': 'assistant'}]