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
Montenegro test is used for diagnosis of: 
Select and explain. 
A. Kala azar, B. Leprosy, C. Malaria, D. Leptospirosis
A: Kala azar
Answer: A: Kala azar 
Explanation: Montenegro or Leishmanin test is a skin test used for diagnosis of kala azar. Intradermal injection of 0.1 ml leishmanin antigen is given on flexor surface of forearm. The skin is examined for for induration after 48 to 72 hours. A reading of >5 mm is considered positive for kala azar. Ref: Park 21st edition, page 281.