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: Microbiology
Not used for diagnosis of Leptospirosis: 
Select and explain. 
A. Microscopic agglutination test, B. Dark field illumination, C. Macroscopic agglutination test, D. Weil-Felix reaction
D: Weil-Felix reaction
Answer: D: Weil-Felix reaction 
Explanation: Ans. (d) Weil-Felix reaction