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: Unknown
[{'content': 'Test discovered by this scientist is a type of \nSelect and explain. \nA. Slide agglutination test, B. Tube agglutination test, C. CFT, D. Ring precipitation test', 'role': 'user'}, {'content': 'Answer: B \nExplanation: WIDAL Fernand Isidore discovered widal test.', 'role': 'assistant'}]