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: Social & Preventive Medicine
[{'content': 'Who propounded the germ theory of disease ? \nSelect and explain. \nA. Leeuwenhoek, B. Robe koch, C. Ambroise Parre, D. Louis Pasteur', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans is \'d\' i.e., Louis Pasteur Louis Pasteur (1822-1895) demonstrated by the presence of bacteria in the air, thereby disproving the theory of "spontaneous generation" and proposed "germ theory of disease"', 'role': 'assistant'}]