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: Microbiology
Tuberculin test positive is dependent on - 
Select and explain. 
A. Erythema, B. Nodule formation, C. Induration, D. Ulcerative change
C: Induration
Answer: C: Induration 
Explanation: None