This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
Tuberculin positivity means: 
Select and explain. 
A. Immunodeficiency, B. Resistance to tubercular protein, C. Infection with mycobacterium, D. Patient suffering from disease
C: Infection with mycobacterium
Answer: C: Infection with mycobacterium 
Explanation: Infection with mycobacterium