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
Tuberculin positive means? 
Select and explain. 
A. Immunodeficient patient, B. Resistance to tuberculin protein, C. Patient is infected with mycobacterium, D. Patient is suffering from disease
C: Patient is infected with mycobacterium
Answer: C: Patient is infected with mycobacterium 
Explanation: 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