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': 'T. pallidum was discovered by - \nSelect and explain. \nA. Schaudinn and Hoffmann, B. Ellerman and Bang, C. Two, D. Robe koch', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Schaudinn and Hoffmann", 'role': 'assistant'}]