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
Which of the following is not true about the Tuberculin test - 
Select and explain. 
A. It is only tool available for estimating the prevalence of TB in a community, B. Induration of 10 mm indicates a positive test, C. It is a specific test, D. New cases occur more commonly in patients who are tuberculin reactors
C: It is a specific test
Answer: C: It is a specific test 
Explanation: The validity of tuberculin test is subject to variability. It is limited by lack of specificity Reference; Park&;s Textbook of preventive and social medicine, 24th edition.Pg no. 196