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
In patients with leprosy, lepromin test is performed after injecting intradermally 0.1 ml of lepromin. This test is used for: 
Select and explain. 
A. Treatment, B. Prognosis, C. Diagnosis, D. Epidemiological investigations
B: Prognosis
Answer: B: Prognosis 
Explanation: Lepromin test is not a diagnostic test, as it may give positive result in normal subjects and negative results in lepromatous and near-lepromatous cases. Uses of Lepromin test: To evaluate the immune status (cell mediated immunity) of leprosy patients In classifying the disease To estimate the prognosis of leprosy patients Ref: Park's Textbook of Preventive and Social medicine, 19th edition, Page 271.