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
A labourer involved with repair-work of sewers was admitted with fever, jaundice and renal failure. The most appropriate test to diagnose the infection in this patient is - 
Select and explain. 
A. Weil Felix test, B. Paul Bunnell test, C. Microscopic agglutination test, D. Microimmunofluorescence test
C: Microscopic agglutination test
Answer: C: Microscopic agglutination test 
Explanation: None