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': 'Pneumonia "alba" is due to: \nSelect and explain. \nA. Klebsiella, B. Streptococci, C. Treponema pallidum, D. Staphylococci', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Treponema pallidum', 'role': 'assistant'}]