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: Medicine
[{'content': 'Pneumonia alba is due to - \nSelect and explain. \nA. Klebsiella, B. Streptococci, C. Treponema pallidum, D. Staphylococci', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]