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': 'Germ theory of disease was proposed by \nSelect and explain. \nA. Louis Pasteur, B. Robert koch, C. Paul Ehrlich, D. Joseph lister', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Louis Pasteur proposed :\n\nPrinciple of fermentation\nPasteurization of milk\nSterilization techniques\nGerm theory of disease.', 'role': 'assistant'}]