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: Medicine
Montoux test is 
Select and explain. 
A. Diagnostic test for TB, B. False positive reaction seen in  immunocompromised, C. Highly sensitive test and low specificity, D. Boosting is maximum after 4 weeks of initial test
D: Boosting is maximum after 4 weeks of initial test
Answer: D: Boosting is maximum after 4 weeks of initial test 
Explanation: Mantoux test is screening test for latent TB infection.
It has low sensitivity and specificity.
False positive reaction  - occur with BCG vaccination and False negative reactions - occur in immunocompromised individual.
Increase in induration (Boosting) is seen between 1 - 5 weeks after intial test.