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
[{'content': '20-year-old boy has admitted with history of fever, icterus, conjunctival suffusion and hematuria for 20 days. Which of the following serological test can be of diagnostic utility: \nSelect and explain. \nA. Widal test, B. Microscopic agglutination test, C. Paul-Bunnell-test, D. Weil-Felix reaction', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. is. (b) Microscopic agglutination test', 'role': 'assistant'}]