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: Skin
A 16 year old student repoed for the evaluation of multiple hypopigmented macules on the trunk and limbs. All of the following tests are useful in making a diagnosis of leprosy, except: 
Select and explain. 
A. Sensation testing, B. Lepromin test, C. Slit smears, D. Skin biopsy
B: Lepromin test
Answer: B: Lepromin test 
Explanation: B i.e. Lepromin test Lepromin test has no diagnostic value; it has only prognostic significanceQ as it tells about cell mediated immunity & classify the type of disease. Lepromin test is most positive in TT because cell mediated immunity is least suppressedQ